Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2d8c6b6742bc09…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 02:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b46e46e02f74f51d49f3f873f2ede8 SHA-1: 162adc1cfaf39b7e1059a30eab1f4e75651445f4 SHA-256: 9c2d8c6b6742bc09833963cc07ffee2b2ae017674d320f4e7fb725de2a6b4e72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one pointing to 'zajinet.ru', identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to 'data structures coding problems'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=data+structures+coding+problems
    • https://cdn.sqhk.co/tufuboloruj/9Kginia/panonudosujalukunelinaji.pdf
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6009ec87711bb.pdf
    • https://cdn.sqhk.co/gijesali/rcOLgc2/87495791415.pdf
    • https://jowudanomigi.weebly.com/uploads/1/3/1/4/131455141/valezajif.pdf
    • https://static.s123-cdn-static.com/uploads/4493569/normal_5ffca05fef3e0.pdf
    • https://cdn.sqhk.co/vimexuda/qBnXnji/japeterofitun.pdf
    • https://cdn.sqhk.co/maxegugej/d4icEjb/nissan_gtr_wallpaper_iphone_11.pdf
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/9ced45f8980cd3a.pdf
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/c89811955a.pdf
    • https://cdn-cms.f-static.net/uploads/4466413/normal_605d75b0a6d4a.pdf
    • http://kasovipitafo.22web.org/bangla_movie_new_song_audio.pdf
    • https://static.s123-cdn-static.com/uploads/4486751/normal_5fde819e3e4c6.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/Uiadijv/zuzililopetile.pdf
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60246ff184f61.pdf
    • https://resodapiperuxa.weebly.com/uploads/1/3/1/4/131407292/5310851.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuforewebub/indian_accounting_standards_2019.pdf
    • https://s3.amazonaws.com/levovod/free_vpn_android_china.pdf
    • https://s3.amazonaws.com/zakunafu/lagrange_s_mean_value_theorem.pdf
    • https://s3.amazonaws.com/kumasala/nopib.pdf
    • http://begulazelukej.rf.gd/black_desert_online_sea_slow.pdf
    • https://s3.amazonaws.com/wovigebi/chemical_equilibrium_expression_worksheet_answers.pdf
    • https://s3.amazonaws.com/pavujiniz/5e_barbarian_guide_xanathar.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000f245.bin
674d371f879dca00909ca903c4243acb3aa23649d3c6aa1c1f535ef7053f97a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 5532 bytes
font_01_sfnt_off00010500.bin
bbebdaf586597b0f7aaa5840fc80f0d2ef123869d334db79b989bb7edd0768db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10964 bytes
font_02_sfnt_off00012ad2.bin
49230a07578f2a0b108554ff1d47b1cb24b8f8081254bad551c0ce72ea05e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16544 bytes

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