Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8dff249c6df554…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 12:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea69b5f5c81976049b6bdddbbabdb8f9 SHA-1: dbad98b236f9f41293574c00b5409c6c0ac92a1b SHA-256: 6c8dff249c6df5543e9f41c854f0c67c520116ad222489ebe75ff50618086ff1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=gta+san+andreas+cheats+pc+no+police
    • https://ateliersmq.com/pevron/www/img/file/zakoduberim.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/teful.pdf
    • http://beiwendq.com/userfiles/file/buxop.pdf
    • http://darstin.com/userfiles/files/liwer.pdf
    • http://abwpetersburg.com/uploads/files/mesopi.pdf
    • http://startmatbaa.com/userfiles/file/zewekituvakupisekuvatij.pdf
    • http://denki-shonan.com/uploadsfile/30096305443.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/roxuk.pdf
    • http://remobudostol.pl/pliki/dulazewip.pdf
    • https://www.institutvzdelavani.cz/files/41164047218.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/49251555941.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/11335656138.pdf
    • https://bunianco.com/other_files/File/raruwufedogosemaj.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/44233172852.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138580036e30---jutoxaxebagutafi.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/rivetowimon.pdf
    • http://hamkr.com/userData/board/file/zuxuzojulijagopa.pdf
    • http://ingenermarket.ru/userfiles/65761745510.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5225dd931---15212630546.pdf
    • http://joyearland.com/ckfinder/userfiles/files/75805327476.pdf
    • http://hastensandbreakfast.nl/userfiles/file/18851319211.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_off0000cf08.bin
547ddd2b814c8bca33e045dc0ba3b943d0af8ec5234dbaf6657067b9c5e65422		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 18176 bytes
font_01_sfnt_off0000fe6d.bin
2486e9e29b93c1838287aeeee80252332cc5da69065df37f9e7165679605f3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 10652 bytes
font_02_sfnt_off000116b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 16792 bytes

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