Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5277e9718a669b2…

MALICIOUS

PDF

39.1 KB Created: 2021-09-27 07:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3f072ebdb6505b013f1bf89eb78bd8e SHA-1: e7a295b41cbebdc7f33f7e9b009b56252cd018cb SHA-256: c5277e9718a669b24a2b8d2fc6939ca0c754332ae86eadd2bae212e6db58479b
144 Risk Score

Malware Insights

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

The PDF is identified as an image-only document designed as a lure, typical of phishing attacks. It contains multiple external URIs, including one pointing to 'crysiq.ru' with a 'googlemail+log+on' parameter, strongly suggesting credential harvesting. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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 39 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://crysiq.ru/uplcv?utm_term=googlemail+log+on
    • https://coluer.ir/documents/file/namewur.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/daxizezezevila.pdf
    • http://sochisushi.nl/survey/userfiles/files/bipexiwujajoziribagobosak.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613870559cdc6---nomisitezuzog.pdf
    • https://clifestyle.net/uploades/userfiles/file/vuwagixi.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e2dba544---36119927961.pdf
    • https://autoteam.in/ckfinder/userfiles/files/43086665014.pdf
    • https://gameclub.by/uploads/files/laxali.pdf
    • http://mylodge-naoshima.com/dutidijoxotodefofuzofi.pdf
    • http://yourtruck.be/upload/ckeditor/file/pebazufizolumi.pdf
    • http://linker-apps.com/files/vopaxajotowadilimavafi.pdf
    • https://erdemlerkoleji.com/resimler/files/75286835731.pdf
    • http://turbotechnik24.de/userfiles/file/29133941395.pdf
    • https://galerieportelouise.be/userfiles/files/konitew.pdf
    • http://fszhenjia.com/upfolder/e/files/20210908212904.pdf
    • http://kukubara.com/zdjecia/file/42892796726.pdf

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