Malicious PDF — malware analysis report

Static analysis result for SHA-256 5905df5f83ef5f3e…

MALICIOUS

PDF

46.8 KB Created: 2021-09-28 04:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc47e08c8d011f0cebc3a6de718baa75 SHA-1: ad2820c115cc9a1d015261e6b0369b1833f4aa70 SHA-256: 5905df5f83ef5f3ec9ff8314df1aadafb3ac3f5489ab2d9af156976266d555ee
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts with few links per host, characteristic of SEO spam or phishing campaigns. The ML classifier and ClamAV detection confirm the malicious nature of the file, likely used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7242

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rosg.net/sa_upload/userfiles/file/20210903213401.pdf In PDF document text
    • http://canoeing.by/pics/files/8176369106.pdfIn PDF document text
    • http://bjallstar.com/upload/file/wigogekeriniwukexalenixis.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/54441185082.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/61390187921.pdfIn PDF document text
    • http://nature-revive.org/files/file/jivepujuzagav.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/52833645877.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210925135442_5o9nkt.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/43a33330755234bf6d32f0c8b328adfd/vupodosab.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/6632021352.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/35370179248.pdfIn PDF document text
    • http://tyextractor.com/d/files/55525297289.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/fiforovi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9c3b4039---32801000063.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zevubiwilifi.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/93194428243.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/73425684631.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/rixosumizopuvobofekazi.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210922_042725.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/repoxidomexovudusewunu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=windows+7+professional+64+bit+key+2020PDF link annotation