Malicious PDF — malware analysis report

Static analysis result for SHA-256 044276ff1f78a286…

MALICIOUS

PDF

68.7 KB Created: 2021-02-24 15:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4740bec59ca73a63f6216c30108863b SHA-1: 776a09e6d65f102288f7f297a9e017bf611c0e82 SHA-256: 044276ff1f78a2863a613de39df3256bc9e418f80306a92bc74c70ab2096fa3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=warriors+don%2527t+cry+chapter+23+summary
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/manetiwulide.pdf
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/e72ecbd33.pdf
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fca212ca3307.pdf
    • https://cdn.sqhk.co/lekibefefu/j9gfjgf/rts_classroom_emerging_strategies.pdf
    • https://cdn-cms.f-static.net/uploads/4428342/normal_60143e50ca02f.pdf
    • https://cdn.sqhk.co/dufukeraj/giqgijc/52099423447.pdf
    • https://cdn.sqhk.co/vabalogu/dajf2jf/puwevuk.pdf
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/ecad5.pdf
    • https://valabonef.weebly.com/uploads/1/3/1/3/131379230/xabus_foxuwuk_wozot_mofazovuvogi.pdf
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5fee61a636c4f.pdf
    • https://cdn-cms.f-static.net/uploads/4393883/normal_602ae86a6f9ce.pdf
    • https://cdn.sqhk.co/xaloxezajaga/S1Biaf4/dekilofurijanewoz.pdf
    • https://cdn-cms.f-static.net/uploads/4386828/normal_601e6733331a1.pdf
    • https://cdn.sqhk.co/xamitarerivu/Tvgf4jg/transformers_robots_in_disguise_2001_cast.pdf
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/pawutivuzipezageju.pdf
    • https://cdn.sqhk.co/fumodolanes/iaPtVtZ/big_notorious_music_greatest_hits_album_download.pdf
    • https://cdn.sqhk.co/kidirugolo/cqQiezT/judogagoruged.pdf
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fe2cbb7291c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jatamez.epizy.com/adobe_photoshop_cc_2018_highly_compressed.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17a.bin
474c9a7725372790b46289ee05b26a53f33e5c86cbdc3fe72c95c9617d707fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 5728 bytes
font_01_sfnt_off0000e4eb.bin
2178fa512ebe3a6f07c2449a0c1d8a13ce00ac6f2596442e104b434826610a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 9492 bytes

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