← All detection heuristics · Social engineering
high
PDF_IMAGE_DOCUMENT_REVIEW_HOST_LURE
What it means
An image-only document carrier links to a host named like a review, signing, or sharing service.
Why it fires
Established DocuSign, Microsoft, SharePoint, Canva, Dropbox, and Google domains are excluded; a generic image link is insufficient without document-workflow naming on the destination host.
Other Social engineering heuristics
SE_BOOKING_COMPLAINT_PHISH PDF_FAKE_DOCUMENT_COMPONENT_INSTALLER OOXML_QR_CREDENTIAL_PHISH SE_CALLBACK_SCAM_TEMPLATE PDF_BRAND_ACCOUNT_UPDATE_REDIRECT_LURE PDF_IMAGE_REPEATED_DECOY_REDIRECT_LURE PDF_LOCALIZED_DOWNLOAD_HOSTING_LURE PDF_MINIMAL_VIEW_DOCUMENT_REDIRECT PDF_NESTED_ENCODED_CROSSHOST_REDIRECT PDF_RFP_EXTERNAL_ACTION_LURE PDF_UTILITY_REFUND_OFFDOMAIN_LURE PDF_SPARSE_MOVED_ARTICLE_DOORWAY