Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aec9265a033bf13…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 04:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cbfcd5011b5c019f26d5eede7617567 SHA-1: f4d77f116f17eb7818443df8a9cf0e86d9d6eda5 SHA-256: 8aec9265a033bf13797f93730528a6f28458029ec41280b03811d42e4ba98efd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document instructs users to copy and paste commands into a shell, a common technique for executing malware. Numerous external URLs were extracted, likely serving as download sources or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crewmak.ru/uplcv?utm_term=cara+downgrade+app+di+android PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/88260445428.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/22010643666.pdfIn PDF document text
    • http://montesantangelo.it/files/files/62832985636.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/xerodopobumonilabalomazuf.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/xajekoga.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/88305392625.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/22564920987.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/wuwafawifafepawafak.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/xipozasosavaxozido.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210903230208_kpf62l.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/wobav.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/57634378055.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/89602116080.pdfIn PDF document text
    • http://baove24h.org/upload/files/68345044882.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/36673667526.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/jalixigevutafugovidugu.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/muxajuginetek.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/lezowutadarugifepopeze.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/57139494887.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0ae6b48c---sonaxefujobiletukuvufo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/34892428000.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/tapisigiful.pdfIn PDF document text
    • https://tch.lu/files/files/72202546190.pdfIn PDF document text
    • 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10372 bytes
SHA-256: 51d0a6ab89c4a485e2a94861f12e3f8cd4201511e98f637e3db7496c5e990e6b
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 18104 bytes
SHA-256: a87b3c0692dba27490a60d9bc8fc107516c830b4580025339d53edb547a55b56

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