Malicious PDF — malware analysis report

Static analysis result for SHA-256 1788cb07a024c66a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 19:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 981c66ac600f9448bde561997f9cf564 SHA-1: ec61ff0ccdc4308a3ff89e32a92ed689e850e885 SHA-256: 1788cb07a024c66aa91d3bfa06216d8967c781c6da425166ee6a2ace33876ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically advertising a 'gta 6 game download apk' to entice users to click. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit user interest in popular games to drive traffic to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=gta+6+game+download+apk
    • http://gongotour.com/FileData/ckfinder/files/20210912_697B2598360333D3.pdf
    • http://vecsecity.info/editor_up/sobebudipide.pdf
    • http://sql110.com/pic/52564244106.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/97766487372.pdf
    • https://gopherscopes.com/userfiles/file/diboworet.pdf
    • http://misosmile.com/upload/editor/files/warevenowedivulitutawo.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/rojavufisafasikeped.pdf
    • http://brunagabriele.it/userfiles/files/95471324219.pdf
    • https://dialogueinpraxis.net/files/docs/87990755297.pdf
    • https://vongtaytramhuong.vn/upload/files/pudamutapa.pdf
    • http://austral-immo.com/userfiles/files/69059589859.pdf
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/viruduwaxilugu.pdf
    • http://indianspringhomes.net/userfiles/files/87224061674.pdf
    • http://www.lbtfilm.com/uploads/files/kunukulavejatavif.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c244c3481d---66723753127.pdf
    • http://silesiacapital.eu/data/file/5540144574.pdf
    • http://clairerolo.com/userfiles/file/63961549877.pdf
    • https://yifff.se/userfiles/file/60243482847.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc944d5db6---jawopugotup.pdf
    • http://t-eamplus.de/web/editor/files/92691325095.pdf
    • http://ilkconstruction.com/Images/Media/files/nexexonanijagedira.pdf
    • http://sswjeans.com/files/jigajet.pdf
    • https://villadorottya.hu/uploads/frontend/files/forilinuzifajonitib.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://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_off0000ca87.bin
2d7d891ea4ff69277ee544c11b081d90c2a27b36f48e66f501376bab39f651e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 10760 bytes
font_01_sfnt_off0000e332.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
font_02_sfnt_off0000fb44.bin
e92a03fcf14b282da7217ec105d5bc60025fc8589d3afecfe6407e49222e4195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 17464 bytes

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