Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a4fd53bf738383…

MALICIOUS

PDF

55.7 KB Created: 2021-09-12 13:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ad4a6f16faec43e0364ba65d671dd21 SHA-1: 692c49610cc64ba8cb3d3198a60a5533c1de3b68 SHA-256: b5a4fd53bf7383835a1a148941d1aade419a967e6a884fb3db8aa1484ed3b4c7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7241

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/tobakenogu.pdf In PDF document text
    • http://mabifitness.it/userfiles/files/bokeborusuravojosun.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60c30e6a9---xuxozibevujimenuduzesogoz.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/dazezokujobefun.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce6dc71bd7---toxufikozisogojo.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/94115260122.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/70532769946.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dufufujibufazavew.pdfIn PDF document text
    • https://wasael.com/userfiles/file/84785218716.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/80780958894.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/85892000770.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/buguja.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/gobifovibupofu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/musakulunusabajowamubukow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kama+sutra+book+freePDF link annotation

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