Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c34b5a484d4418d…

MALICIOUS

PDF

75.6 KB Created: 2021-10-14 09:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 497f070e76318c56f6e4d9c5f5c071c6 SHA-1: 2d1f5386859caec5361ffa8fdb89e3fab4810df8 SHA-256: 2c34b5a484d4418d4fa778b9e5d70ae8405ed60cab16c06a267743d653e51ad9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://mariekevanvlierden.nl/survey/userfiles/files/70329463730.pdf
    • http://fsgzb.com/upfolder/e/files/20211007144601.pdf
    • http://izmirtavla.com/upload/file/92426718361.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/lowoxudoxubij.pdf
    • http://kayapalinakliyat.net/file/39711154972.pdf
    • http://travelspace.pl/userfiles/file/13478457055.pdf
    • https://vietnam-pump.com/userfiles/file/famusafufepotixo.pdf
    • http://tavio.su/files/file/xojagozutazo.pdf
    • http://www.atsamuihaus.com/image/upload/File/pelunabepixutuwetugogugu.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9dfdba2fbe5a7331d1463c74b078f25d/98640363128.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tamopirozela.pdf
    • http://life-worldwide.org/assets/uploads/files/93966202382.pdf
    • https://buyafranchise.org/files/files/gizikovogogigudelagobe.pdf
    • http://csc-027.com/userfiles/file/20210925085400_ei0yjp.pdf
    • http://duet-czluchow.pl/userfiles/file/65397782771.pdf
    • http://decamiones.com/userfiles/file/45736967401.pdf
    • http://epoch-making.jp/js/upload/files/51577613916.pdf
    • http://delfosventures.com/userfiles/files/11272405405.pdf
    • http://ckpak.com/fckeditor/userfiles/file/kalaxiguwedudimibis.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/24958486762.pdf
    • http://shipsupply.ru/userfiles/files/weberoniwogirozileja.pdf
    • https://marblobathware.ph/app/webroot/img/files/40541581332.pdf
    • https://diarch.in/WYSIWYGImage/file/46665449478.pdf
    • http://khojedu.net/userfiles/file/noroxemopejerej.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a3f4eb5805ab1cbc03eb61ac4f794172/refizimuvux.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=competitive+programming+3+by+steven+and+felix+halim
    • 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_off0000be85.bin
a95c23db360f3dc0d8ecfcb4f0f2cce12d82820a9f7dfcc4cafe2167207c61d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 17948 bytes
font_01_sfnt_off0000ed36.bin
074ed2459dc42bdcf7de6837acea6d6c7f7155ff6a4559d1bf6bfeb24811421a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 11568 bytes
font_02_sfnt_off00010823.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16792 bytes

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