Malicious PDF — malware analysis report

Static analysis result for SHA-256 9020f1851c33274b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 07:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfeb0cf11c3318a6d44859bb6fc9e7a7 SHA-1: 1fea4a06bfeabd9774248f424f54a638bbabd1a3 SHA-256: 9020f1851c33274bb32019e1870f5055a91d4289531d12dd21c9a1fcfe44aa42
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body is unreadable, but the PDF structure and heuristics indicate a malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8329

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://chinastom.ru/userfiles/file/gafego.pdf In PDF document text
    • https://euro-m.si/web/dokumenti/file/bewanep.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/papizapu.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/66547907590.pdfIn PDF document text
    • http://atrsara.ir/resource/files/bolen.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/90511623345.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/fizagados.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pojosakuberaw.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/jabom.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394bc1831---nunisepawubefajegedip.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/naxet.pdfIn PDF document text
    • http://gewald.ru/content/Files/15058001983.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xewulodefu.pdfIn PDF document text
    • http://clingac.com/d/files/10640721705.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/40325946837.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/94017078608.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/xiselojoposobunomidofoxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+release+wikiPDF link annotation

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