Malicious PDF — malware analysis report

Static analysis result for SHA-256 2596cbd3dfdc47b3…

MALICIOUS

PDF

75.1 KB Created: 2021-04-02 04:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7e846edfbea2804a31456af1592d63a SHA-1: 5da6de50e9d2abad29b6b70babb392be51a3194a SHA-256: 2596cbd3dfdc47b3661fbe2cbd0c1de29aae2cabff12d2340c4c73b4599d9a6e
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URLs, including one pointing to 'golowaki.ru', suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, appears to reference software for merging PDF documents, likely a lure to disguise the malicious intent of hosting numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=logiciel+pour+fusionner+des+documents+pdf
    • https://cdn-cms.f-static.net/uploads/4479235/normal_6063e32dca7e7.pdf
    • https://xojowikenokux.weebly.com/uploads/1/3/4/7/134706662/2216539.pdf
    • https://cdn-cms.f-static.net/uploads/4393019/normal_601df3971195b.pdf
    • https://cdn-cms.f-static.net/uploads/4450864/normal_60313c7db1e04.pdf
    • https://jadusozig.weebly.com/uploads/1/3/5/3/135327359/kebufajobovopizalem.pdf
    • https://xoforovujedopod.weebly.com/uploads/1/3/4/5/134587448/jukadelakir.pdf
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5feb0fa874483.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_603b3ab9b0865.pdf
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/8171715.pdf
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/7668821.pdf
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/vefifubonaj.pdf
    • https://zawimadugujesu.weebly.com/uploads/1/3/4/7/134713294/2380485.pdf
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/1601227.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowanesivokadeb.rf.gd/analytical_chemistry_interview_questions.pdf
    • https://s3.amazonaws.com/farowug/14275692515.pdf
    • https://s3.amazonaws.com/jinotugiwomo/37751233647.pdf
    • http://sojefebil.rf.gd/62625010849.pdf
    • https://s3.amazonaws.com/vojapu/49380148446.pdf
    • https://s3.amazonaws.com/voxulija/16969779854.pdf
    • http://kalilom.epizy.com/juxefumavodiwipipesapi.pdf
    • https://s3.amazonaws.com/kisagoz/zevukiluzafapitogekepifux.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_off0000e438.bin
6f7fe473874f454d1e3e2f6526aeb7f10ca138d8d27c1769c8f00c3a6ac1f85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 5204 bytes
font_01_sfnt_off0000f5ec.bin
4c62c4aae2671a5e82c9bd8d528b385a5b7fd0d35e3b2162f210598313ddbd55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 12492 bytes

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