Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a6e6483b57faf6…

MALICIOUS

PDF

84.9 KB Created: 2021-04-05 22:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a2f9e1b180e861849deab70b3eeb674 SHA-1: 2c65f0e9966109c5a66f0924c7f9b78f9d319f25 SHA-256: 66a6e6483b57faf654fcf8ef63e3fe0c78fabb201138b45318389a1b64785d69
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, with a primary one pointing to 'vilenefex.ru', suggesting it functions as a link farm to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a malicious intent to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=heat+conductive+rubber+sheet
    • https://cdn-cms.f-static.net/uploads/4416150/normal_602d0bac7150f.pdf
    • https://static.s123-cdn-static.com/uploads/4393883/normal_5fc6b7e7a32e0.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_604e9fa2b49da.pdf
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/bejozot_marobo_tozegumisi_mebokudore.pdf
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/0c796ac11.pdf
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5feb3be407cfc.pdf
    • https://daxoruliwoj.weebly.com/uploads/1/3/4/5/134585145/mixakarabasuje_guzejos_wuniwalagilujim_zegadavel.pdf
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5ff13d6b77eba.pdf
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/7402171.pdf
    • http://vnds-v.website/komozijupoxaxaj90nqt.pdf
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/4446472.pdf
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcf598434c3a.pdf
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/2d6ac51a.pdf
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5feb55a3e8930.pdf
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/5743476993955.pdf
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5ff88483de1b4.pdf
    • http://xeresorejal.iblogger.org/bar_rust_235.pdf
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/badb62bd2f7b.pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_604d8f3dc519d.pdf
    • http://tradebot.space/76753381048khn03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bozisiruvaletun.rf.gd/gudetenemeneforuzufutix.pdf
    • http://jexobifigewago.epizy.com/detonogaxiludumi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c2.bin
a9b17bd867a7879173ee6757232a95ae8f8a67dcf26410dcf87098b818827477		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 2988 bytes
font_01_sfnt_off0000f364.bin
7c0519750b26b70533e1ca31c4d846b9eb262f5b0a2078415f078865c1452c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 5156 bytes
font_02_sfnt_off000104e6.bin
3dea82e20d7f8e46ae384a37084386eb0c03a26c30d1a2558473a8ed1c3a6433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 12292 bytes
font_03_sfnt_off00012e77.bin
32e6027209d50c62fc426cfb9f13cd10b221ddef2152e2e24dd8ea0089c267fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 16512 bytes

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