Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd02ab203155162…

MALICIOUS

PDF

88.1 KB Created: 2021-05-27 07:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b82ad9cb1abc86c45aed793884b9b9 SHA-1: d79de4628dfeb339c963d28fd3d05eaf62c99e3b SHA-256: 4fd02ab203155162d9ab4e01a8aebd173043255a53d80511f251051424dd3adc
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, identified as a PDF link farm. The primary URL, 'https://vilenefex.ru/strik?utm_term=clash+of+clans+best+th9+dark+elixir+farming+base', suggests a lure related to a popular game. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or distributing further malicious content through the numerous linked PDFs. No scripts were extracted, but the structure itself is indicative of a phishing or spamming campaign.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=clash+of+clans+best+th9+dark+elixir+farming+base
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5feb38cfb1068.pdf
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/rufepatexeg.pdf
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fed7a0692e69.pdf
    • https://cdn-cms.f-static.net/uploads/4374682/normal_6022094413aea.pdf
    • https://cdn-cms.f-static.net/uploads/4473359/normal_6050c3295380d.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/e84cd8c232316.pdf
    • https://cdn-cms.f-static.net/uploads/4461249/normal_603b59ed078d2.pdf
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/59cd63.pdf
    • https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/zojipevexurafirof.pdf
    • https://cdn-cms.f-static.net/uploads/4493920/normal_60493ecf4b8e6.pdf
    • https://dodukaviwuzan.weebly.com/uploads/1/3/4/6/134635993/gudowana.pdf
    • https://cdn-cms.f-static.net/uploads/4366000/normal_6014b95133e15.pdf
    • https://motexajuji.weebly.com/uploads/1/3/4/4/134467272/gofetamojosasuz.pdf
    • https://dijideloduxez.weebly.com/uploads/1/3/4/3/134362038/rikiruw.pdf
    • https://sekonumewazu.weebly.com/uploads/1/3/4/1/134131339/999020.pdf
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/996e299.pdf
    • https://cdn-cms.f-static.net/uploads/4408485/normal_605ef26942060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b80.bin
739a375561ea66473caf96c029729c6449b2a02faa3ed9e9236e09b96126e631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 5676 bytes
font_01_sfnt_off00011e9a.bin
2ffc22c1ac6c9500c529f66d1afc5fdcbe6476e7cb50cce0a844b5fa2664864a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 11336 bytes
font_02_sfnt_off0001451a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1451A 4324 bytes

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