Malicious PDF — malware analysis report

Static analysis result for SHA-256 901225eb54224a39…

MALICIOUS

PDF

96.4 KB Created: 2021-10-20 08:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8b51c5b3f62345cd56bb45e40ce52cdd SHA-1: 4907d64edaf289da85e467b8c1680de6d7798339 SHA-256: 901225eb54224a391e29cc67295e1f3942ad3c6b52da173176e99e28511de440
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9460ed253923c68916ca1ce25b37df68/17026964657.pdf In PDF document text
    • http://skolky.info/foto/images/file/56450291455.pdfIn PDF document text
    • http://terminsk.by/pics/files/40431933572.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57394285306.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/redofatikezabiloru.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/15106132245.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/30917480332.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/vafebewapexiboz.pdfIn PDF document text
    • https://anjingliar.com/contents/files/2539294428.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/79866506021.pdfIn PDF document text
    • https://visualarchive.bg/files/10701164743.pdfIn PDF document text
    • http://arucax.am/user_images/file/77277245083.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/95631482742.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/xapopelagasutu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/26919854809.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/nojid.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/jodovozogojoworomedafovu.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/muziwizimo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616d91894cd37---94323123120.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/13729317225.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/limukesarazudodi.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/43542268306.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/93240789835.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=el+coronel+no+tiene+quien+le+escriba+resumen+completoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 10904 bytes
SHA-256: e9c404a348a0cdc1ffbe073295f32f12bbbb36ddfefcca913a4e098c20620511
font_02_sfnt_off00014114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 20388 bytes
SHA-256: a52df30e54ef068a9cf73502d184703b4fd08578fa3021fd3dab2ee7917bbb46

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