Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bb30511e4fadd0…

MALICIOUS

PDF

42.7 KB Created: 2021-09-26 06:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e808ad4155352a4f7239de7abb62d84 SHA-1: af0bed7df29475cab51968f723843d1350df4bde SHA-256: 41bb30511e4fadd02e22e3b6268b7e0fdb18fb4a439c76f2ac3b3c8d46501253
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a phishing lure, utilizing an image-based interface to conceal a clickable link. The embedded JavaScript and numerous external URLs, including one pointing to 'smidgel.ru', suggest an attempt to redirect the user to a malicious website. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7814

Heuristics 6

  • 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 42 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D1%87%D1%82%D0%BE+%D1%8D%D1%82%D0%BE+%D1%82%D0%B0%D0%BA%D0%BE%D0%B5
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sabaxerawofogotalibe.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/30302740926.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c04d21d3b---25351680232.pdf
    • http://manisafar.com/basefile/marcosafarir/files/lizazoxidenej.pdf
    • http://asckhn.com/acskhn/userfiles/file/vusuxevetiwudefulikisuwa.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/kezuj.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136961964bcd---vijupuboxewemig.pdf
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/xejavetezilulozizonan.pdf
    • http://kondicionery-himki.ru/upload_picture/file/51311016363.pdf
    • http://bkht.vn/userfiles/file/fewozeterezifi.pdf
    • http://vongtaygiay.net/media/ftp/file/kabedazevarotosepoj.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/42744966634.pdf
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/75485115110.pdf
    • http://ambvetfanini.eu/userfiles/files/tarebajotewud.pdf
    • http://voyagevietnamlaos.com/hinhanh/file/14728225653.pdf
    • https://anitt.in/ckfinder/userfiles/files/76661238916.pdf
    • http://pointerboards.com/uploads/admin/files/32807118359.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/76184079092.pdf
    • http://urs-certification.com/gais/image/file/fezak.pdf
    • https://ocloud.millionserenity.com/images/upload/files/dirukafare.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/2601493046.pdf
    • https://vipbeachhouse.com/uploads/editor/file/11808996739.pdf

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