diff -ur Mail-SpamAssassin-4.0.1/lib/Mail/SpamAssassin/Plugin/URIDNSBL.pm Mail-SpamAssassin-4.0.1_fix/lib/Mail/SpamAssassin/Plugin/URIDNSBL.pm
--- Mail-SpamAssassin-4.0.1/lib/Mail/SpamAssassin/Plugin/URIDNSBL.pm	2024-03-26 05:52:09.000000000 +0100
+++ Mail-SpamAssassin-4.0.1_fix/lib/Mail/SpamAssassin/Plugin/URIDNSBL.pm	2024-04-09 15:42:31.054588924 +0200
@@ -430,6 +430,8 @@
     if ($conf->{uridnsbl_skip_mailto}) {
       next if ($uri =~ /^mailto:/i);
     }
+    # we want to skip so-files, they are not url's
+    next if ($uri =~ /\.so$/);
 
     # no hosts/domains were found via this uri, so skip
     next unless ($info->{hosts});