Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c1f26bee7aecd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 06:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef889d558ee68997faac98074974fd7b SHA-1: 7926e16b1ef198823e16b9e3d6d9c5b909b8f9d9 SHA-256: 091c1f26bee7aecd8d252fb9c3faa9bfd2306cdbfb9eb439cb7377e2329bf8e5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary function appearing to be redirecting users to a collection of other PDF files. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, suggesting a tactic to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=cyberpunk+pdf+download
    • http://becucci.it/userfiles/files/52255934129.pdf
    • http://bochkari24.ru/pic/file/pegaloxo.pdf
    • http://baodieptailor.com/uploads/2021-09-04/images/files/rikeriwebopixijekipowep.pdf
    • http://architects-desk.com/uploadsfile/1920672041.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47356097918.pdf
    • http://alrabbancapital.com/file/files/22779953832.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d7547203---pivuverun.pdf
    • http://gramercy-grand.ru/files/file/jidenowesatuwunil.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/47461d555448d9b61b61057b8b35e2d5/bipuxemupug.pdf
    • https://pergamine.com/ckfinder/userfiles/files/pexuxewoxenutekez.pdf
    • http://huemin.com/fckeditor/userfiles/file/76336632177.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143f3cad5fc0---20333704622.pdf
    • https://zenit-npk.ru/files/file/19274731991.pdf
    • http://020tzs.com/baige/images/userfiles/file/36992391127.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/93819671336.pdf
    • http://nensi.si/upload/file/39850556369.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/vilirevukiluxosapinaluki.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/12263041184.pdf
    • http://wsm.hk/images/files/75307967466.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/kaxajib.pdf
    • http://pmrs.ps/userfiles/file/83984092791.pdf
    • http://faisaltowel.com/survey/userfiles/files/32215763710.pdf
    • http://location-appartement-venise.com/italie_documents/files/68174023670.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_off0000d5ab.bin
d9de140b43b04bf379de2fdc3508f9e4727473e47e491c33df894179d191aaf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10696 bytes
font_01_sfnt_off0000ee33.bin
900dab06b771b69a22d9d2c57b6448db82c8ae37ccc2dcb57508cdfcbc2ec6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 21644 bytes
font_02_sfnt_off00012752.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16792 bytes

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