diff --git a/capa/features/extractors/base_extractor.py b/capa/features/extractors/base_extractor.py
index 67607458..93115ca4 100644
--- a/capa/features/extractors/base_extractor.py
+++ b/capa/features/extractors/base_extractor.py
@@ -116,8 +116,6 @@ class StaticFeatureExtractor:
         # this base class doesn't know what to do with that info, though.
         #
         super().__init__()
-        # all extractors must be able to provide a sample's hashes
-        self.sample_hashes: SampleHashes
 
     @abc.abstractmethod
     def get_base_address(self) -> Union[AbsoluteVirtualAddress, capa.features.address._NoAddress]:
@@ -134,7 +132,7 @@ class StaticFeatureExtractor:
         """
         fetch the hashes for the sample contained within the extractor.
         """
-        return self.sample_hashes
+        raise NotImplementedError()
 
     @abc.abstractmethod
     def extract_global_features(self) -> Iterator[Tuple[Feature, Address]]:
@@ -350,14 +348,12 @@ class DynamicFeatureExtractor:
         # this base class doesn't know what to do with that info, though.
         #
         super().__init__()
-        # all extractors must be able to provide a samples hashes
-        self.sample_hashes: SampleHashes
 
     def get_sample_hashes(self) -> SampleHashes:
         """
         fetch the hashes for the sample contained within the extractor.
         """
-        return self.sample_hashes
+        raise NotImplementedError()
 
     @abc.abstractmethod
     def extract_global_features(self) -> Iterator[Tuple[Feature, Address]]:
diff --git a/capa/features/extractors/binja/extractor.py b/capa/features/extractors/binja/extractor.py
index 76ee4097..9f63aebb 100644
--- a/capa/features/extractors/binja/extractor.py
+++ b/capa/features/extractors/binja/extractor.py
@@ -40,6 +40,9 @@ class BinjaFeatureExtractor(StaticFeatureExtractor):
     def get_base_address(self):
         return AbsoluteVirtualAddress(self.bv.start)
 
+    def get_sample_hashes(self) -> SampleHashes:
+        return self.sample_hashes
+
     def extract_global_features(self):
         yield from self.global_features
 
diff --git a/capa/features/extractors/cape/extractor.py b/capa/features/extractors/cape/extractor.py
index 2e91c7db..881802d4 100644
--- a/capa/features/extractors/cape/extractor.py
+++ b/capa/features/extractors/cape/extractor.py
@@ -40,6 +40,9 @@ class CapeExtractor(DynamicFeatureExtractor):
         # value according to the PE header, the actual trace may use a different imagebase
         return AbsoluteVirtualAddress(self.static["pe"]["imagebase"])
 
+    def get_sample_hashes(self) -> SampleHashes:
+        return self.sample_hashes
+
     def extract_global_features(self) -> Iterator[Tuple[Feature, Address]]:
         yield from self.global_features
 
diff --git a/capa/features/extractors/ida/extractor.py b/capa/features/extractors/ida/extractor.py
index 7ac8ec4d..99ffe02c 100644
--- a/capa/features/extractors/ida/extractor.py
+++ b/capa/features/extractors/ida/extractor.py
@@ -42,6 +42,12 @@ class IdaFeatureExtractor(StaticFeatureExtractor):
     def get_base_address(self):
         return AbsoluteVirtualAddress(idaapi.get_imagebase())
 
+    def get_sample_hashes(self) -> SampleHashes:
+        return self.sample_hashes
+
+    def get_sample_hashes(self) -> SampleHashes:
+        return self.sample_hashes
+
     def extract_global_features(self):
         yield from self.global_features
 
diff --git a/capa/features/extractors/pefile.py b/capa/features/extractors/pefile.py
index 17808e9a..e7913440 100644
--- a/capa/features/extractors/pefile.py
+++ b/capa/features/extractors/pefile.py
@@ -195,6 +195,9 @@ class PefileFeatureExtractor(StaticFeatureExtractor):
     def get_base_address(self):
         return AbsoluteVirtualAddress(self.pe.OPTIONAL_HEADER.ImageBase)
 
+    def get_sample_hashes(self) -> SampleHashes:
+        return self.sample_hashes
+
     def extract_global_features(self):
         buf = Path(self.path).read_bytes()
 
diff --git a/capa/features/extractors/viv/extractor.py b/capa/features/extractors/viv/extractor.py
index fde0f7cc..a4f9c748 100644
--- a/capa/features/extractors/viv/extractor.py
+++ b/capa/features/extractors/viv/extractor.py
@@ -49,6 +49,9 @@ class VivisectFeatureExtractor(StaticFeatureExtractor):
         # assume there is only one file loaded into the vw
         return AbsoluteVirtualAddress(list(self.vw.filemeta.values())[0]["imagebase"])
 
+    def get_sample_hashes(self) -> SampleHashes:
+        return self.sample_hashes
+
     def extract_global_features(self):
         yield from self.global_features