Malicious PDF — malware analysis report

Static analysis result for SHA-256 30af8f3ddb96044e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 07:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1af6855d42dadd52d6198882fb6652ad SHA-1: 3b8d325cbba14ef8dd7f53eb6be7c31f9f45921f SHA-256: 30af8f3ddb96044e6184205d1f39e184fdc7536a0356095695bf28154006516b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that redirect to various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further supporting a malicious intent to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=the+great+gatsby+chapter+7+summary
    • http://dioblina.eu/userfiles/file/zoberuludaxitutuvula.pdf
    • http://mgtofubbq.com/uploads/files/zozonitomo.pdf
    • https://gifarlcm.com/upfiles/editor/files/varozodujokas.pdf
    • https://reniuved.it/file/nosovujaxepoxixobanirekof.pdf
    • https://lexconsulting.ro/webroot/files/media/84383427650.pdf
    • http://yuanhebiotech.com/upload/files/13582715686.pdf
    • https://altaitur.com/ckfinder/userfiles/files/71375145486.pdf
    • http://www.lovebliss.tw/UserFiles/files/xogofurunoxarewiwamuxem.pdf
    • http://lokalsport.no/userfiles/file/gusovofegukuzavetenoxali.pdf
    • https://grupa-energia.pl/attachments/file/21471706930.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/kopubugemasibizeg.pdf
    • http://toyotaquangninh.org/data/dulieu/files/99897376374.pdf
    • http://srividyaastrology.com/userfiles/file/23215456781.pdf
    • http://scard.vn/app/webroot/uploads/files/wamatapawuxazefubu.pdf
    • http://ibarugi.com/fckeditor/userfiles/file/bofafupaloneb.pdf
    • http://puginternational.com/ckfinder/userfiles/files/74056306106.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2e2e5bdf019b526075708d8782904c42/84345550931.pdf
    • https://hamasataccessories.com/userfiles/files/gilirimexavo.pdf
    • http://goldia.cz/data/file/38582187859.pdf
    • https://wangwangcamp.com/uploads/files/202109090049325568.pdf
    • https://mysmartedu.com/uploadimages/files/sasedusirewadovalilas.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091705192273499.pdf
    • https://stpm-sa.com/userfiles/file/33682098901.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614211a0a96ab---34336123819.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_off0000d624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16792 bytes
font_01_sfnt_off0000ee36.bin
27e81c9e566bd3e4467cde8d62194f6efc4ba29443b41c610805d79b90879ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 18660 bytes
font_02_sfnt_off00011e97.bin
03f0f056e6cd8c7ed26c37ed184107a6965a8f4f8ba96dc6610410765ac0770e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 10824 bytes

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