Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f42a16ae1d1535…

MALICIOUS

PDF

38.7 KB Created: 2021-09-11 12:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd038af3c2073cc7e7be06b67ad6807e SHA-1: dd2a879818f176af067ed49ce1714708c2491404 SHA-256: 01f42a16ae1d1535970b03b91db3f4c8d51cc67f075cddd59be1112a5a9796ac
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV. It appears to be an image-based lure, typical of phishing attacks, designed to trick users into clicking embedded links. The document body is heavily obfuscated, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a link farm or redirection scheme to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 38 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 http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/keloxaxurujasili.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/xawujipomabudurewuzudofus.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///zizefuvasizovuzo.pdfIn PDF document text
    • http://xycrusher.com/d/files/86262658462.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83625128094.pdfIn PDF document text
    • http://platcometals.com/images/file/giridemugepofujepodep.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/15760889560.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/51404391849.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/36810955843.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/92698419677.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/5596219242.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/29082772089.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136af33f2006---48370693748.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/katimurujuzot.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/98359193652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+studio+notepadPDF link annotation

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