Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c74b45722cbd3a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 11:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 608aaea339e7e7f4382ac0417fdb080c SHA-1: 3a991b99f1773dd2f9606713664567988ee4c255 SHA-256: 20c74b45722cbd3aea8712a0d587f6d0aee73c14259993ac191a4bd7d0e42aff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or conduct phishing. The presence of external URI indicators and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=what+colors+can+you+make+with+purple
    • https://hotlinepro.in/admin/userfiles/file/sabovutadup.pdf
    • http://ashole.hu/UserFiles/File/87191905360.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/13981855696.pdf
    • http://palazzodiaz.com/userfiles/files/65087626722.pdf
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/97150537416.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/65295099719.pdf
    • http://resheto.ru/users_images/fck/file/dibipelawuv.pdf
    • https://promobryansk.ru/userfiles/files/79143507750.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/gafusexamojuwupibaxonumo.pdf
    • https://vinacoma3.vn/userfiles/file/tizonajina.pdf
    • https://izometal.net/mm/file/16671072922.pdf
    • https://rougezenekar.hu/files/file/wewemifatupak.pdf
    • http://rklatex.com/userfiles/file/9480233299.pdf
    • http://cartonwrappingmachine.com/userfiles/file/bekiwope.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a8f401d4b4194f43a1f1c3a30ffd4ed3/duxowiwimagoxoriteru.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/74417221086.pdf
    • http://icmasistemas.com/userfiles/files/soraxatovutovilafa.pdf
    • https://vinacomvietnam.vn/uploads/news_file/folukorajopugejamep.pdf
    • http://zeci.nl/im/image/11744918735.pdf
    • http://leadingedgecorporate.com/user_images/file/21676396414.pdf
    • https://peintures-descours.fr/fichier/files/20390695757.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/tokadanirevovavevux.pdf
    • http://duepassidalcentro.it/userfiles/files/durotideso.pdf
    • http://helder-effect.nl/userfiles/file/45614867226.pdf
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/vavokisuvupufuzav.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_off0000e00f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16792 bytes
font_01_sfnt_off0000f821.bin
5bbf7db6843988711362d960d812c390755f90be272c644d89435ba17224f138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 16544 bytes
font_02_sfnt_off000122bc.bin
d7f99539c0555e8a6d3ab7836ac68e9912f152df42421cd93191222b553a0370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 11024 bytes

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