Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9603f3326246d7f…

MALICIOUS

PDF

37.3 KB Created: 2021-09-09 10:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de42713b3fbb14028aaea02d98593660 SHA-1: ef3f379c45b29ca4471cd540356e245fc7a0fa3c SHA-256: a9603f3326246d7f60f8c05705f5cfdfd9098812c1c0d50406c8c12d04efb290
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 image-only nature and embedded clickable link, a common tactic to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of multiple external URLs suggests a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9611

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://12tiga.com/contents/files/62226095774.pdf In PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/nuxudefefodizizebip.pdfIn PDF document text
    • https://phm.vn/upload/files/vabutemuju.pdfIn PDF document text
    • http://rem-proekt.com/f/file/kidexawidisalaxajutisefab.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b622a1f7d---30047143658.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///41552675019.pdfIn PDF document text
    • http://bunian-co.com/other_files/File/goxuruwobevolenubasus.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/xetomuxufeginamojekiteki.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/72641981274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mp3+video+cutter+apkPDF link annotation

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