Malicious PDF — malware analysis report

Static analysis result for SHA-256 0362a4185e823bbd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 06:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 273b16a28fb5bca145b03e32ff86ccde SHA-1: 35009556bc27ec1c73919ff2b5777b0fda95ff03 SHA-256: 0362a4185e823bbd0efc2e98eaf2eab68aa7441b2381d6e9c28e7e0b5e0d0594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the PDF functions as a link farm, directing users to numerous distinct domains, many of which are suspicious. While no scripts were directly extracted, the nature of the PDF and its embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 http://ordineveterinarivenezia.eu/userfiles/files/76725630819.pdf
    • http://steelfurniturecn.com/d/files/57379439829.pdf
    • http://cadelupo.it/userfiles/files/7504349634.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/27804140130.pdf
    • http://zetrade.cz/userfiles/file/xapamuxitit.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/divaveg.pdf
    • http://ehomeforeclosure.org/images/file/530285373.pdf
    • http://artkulinaria.pl/sites/default/files/file/lakuxatonumitawawujadok.pdf
    • http://autosoftware.company/autoresponders_images/files/21928288064.pdf
    • http://islenapuntos.com/campannas/file/xugixusesilitatixilugi.pdf
    • https://livermore.com/wysiwygfiles/file/66843217237.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/sewekenobolud.pdf
    • http://ciaomamma.hu/editor_up/31231399454.pdf
    • http://mptech.vn/ckfinder/userfiles/files/mawisakejatumiti.pdf
    • http://sity-luxe.ru/userfiles/file/64510643682.pdf
    • http://roland-toys.eu/userfiles/file/momezunido.pdf
    • http://solo-reisen.com/media/images/file/bafumagotol.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/afda946907fabf341c3dbd4b7258e038/84752590643.pdf
    • http://umrllc.com/userfiles/files/tugetukimotis.pdf
    • http://tcihk.com/userfiles/27941033336.pdf
    • https://blnk.eu/userfiles/files/xugivobukonosu.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/7040962126.pdf
    • https://krossi.ru/images/content/files/tunone.pdf
    • http://thecargonepal.com/userfiles/file/zotijesipaludo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+haircut+for+face
    • 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_off0000d9ed.bin
08f3844068f758176388e0f1a96f828bf62e8b3ba9d91e30387616e8a082b292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 10436 bytes
font_01_sfnt_off0000f1cd.bin
274fb1d3d34bdcbb066b456ef877372d645b38a6ee4a444d84b8bfde265bf428		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 17168 bytes
font_02_sfnt_off00011e5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes

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