Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1f96650cd0553e…

MALICIOUS

PDF

37.7 KB Created: 2021-09-13 15:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 720dc20fd6b978edc5b760b2970ad6db SHA-1: d1415906afa25cd5c02b9cad707145f9c1dcdc51 SHA-256: bb1f96650cd0553ec0278dc973ff1f71a96179727f5708c0c0f6c141dcd7dd78
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable actions. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery vehicle for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ventadeterrenosurbanos.com/userfiles/file/30081922965.pdf In PDF document text
    • http://hooleihomes.com/cms_images/file/lenul.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/47137665050.pdfIn PDF document text
    • http://msiutilities.biz/documents/gumusi.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/tapag.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/polojin.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/nuzolesig.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/vumumulefisinan.pdfIn PDF document text
    • https://shunnasato.com/35180354992.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/52250738152.pdfIn PDF document text
    • http://ty-int.com/files/files/41089261268.pdfIn PDF document text
    • http://lawngo.net/fckfiles/406In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+send+photos+from+bluetooth+in+iphonePDF link annotation

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