Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f67daae74505e6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 18:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b1b492ed2ef728f5870173615ab3d10 SHA-1: 672bc6cce8f0a8207033c0f70b75683ce234658f SHA-256: b5f67daae74505e6d32c22691b0ba7866acf458af5f739075b8a5ec15e58b78f
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains heuristics indicating it's a link farm and uses a remote support tool lure, suggesting it's designed to trick users into installing malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://taihegas.com/filespath/files/20210910001433.pdf
    • http://citadelcaralarms.com/userfiles/file/8493665152.pdf
    • https://matagujrischool.com/admin/imagetemp1/file/90491434856.pdf
    • http://rafaelokazakov.com/file/83561787847.pdf
    • https://atrax.eu/userfiles/file/92764602959.pdf
    • https://westhygiene.hu/editor_up/78878280212.pdf
    • http://hoya-system.com/uploads/files/202109131423596447.pdf
    • http://debten.net/UserFiles/File/lovizerewilevigeru.pdf
    • http://ouhkpthaa.org/userfiles/vesidetabogij.pdf
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/tazevopigurinofudi.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-14/20210914172354148397.pdf
    • http://wangyiphk.com/userfiles/dirojuxudomekomelazel.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/64982441180.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/40902373184.pdf
    • https://guruvinodji.com/Userfiles/file/15947218788.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c820ec5c0d---mazotetugozivof.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/68992752248.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e88359c195f350a3cbc093926b2381e/fenixivebigokeruvalo.pdf
    • http://fc-junajted.com/upload/datoteke/lazirulapavupipowonofa.pdf
    • http://vinhosnorte.com/images/files/pobewuvubopamikad.pdf
    • http://fjsxsx558.com/upload/files/zoroz.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/51345296564.pdf
    • http://edmo-cars.nl/images/file/zivepasas.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/66505430217.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=teamviewer+mobile+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e1.bin
b153ebd7bb55fc12b35b1b2445149d6599690f21003fcad0d960338217c8675c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E1 10396 bytes
font_01_sfnt_off0000d852.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 16792 bytes
font_02_sfnt_off0000f064.bin
f7a120986e0487da5e72eb3f92d51f7ecd8a49ec9518c97621163b058eb454f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 19744 bytes

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