Malicious PDF — malware analysis report

Static analysis result for SHA-256 6279ad7898a1c064…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bda764adbae7b2afc59a4bc7fdc8408 SHA-1: 5b2621fc643c8cc670da8c11f07f70ce2bac956e SHA-256: 6279ad7898a1c06479d99ef35e8a29ab061d5f4eabc11f4a06ec7ab9f24e0eb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=d%26d+players+handbook+pdf+5e+pdf
    • http://kingswaytyres.com/project/kingsway/uploads/file/91935311011.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ec4e29rlf4o93a60mlrdgrec97/zituxegimibikinemuwe.pdf
    • http://hankyunget.net/userData/board/file/88954608627.pdf
    • http://kfbma.org/files/fck/file/22707647360.pdf
    • https://decisionstogo.com/fck_image/file/rubaf.pdf
    • http://nawoo.net/userData/board/file/galodunadelox.pdf
    • http://pk.mo/userfiles/file/29500704889.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/zejawovawig.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367013329d6---87497104982.pdf
    • https://vildmarksjagt.dk/userfiles/file/24424419119.pdf
    • https://marblo.com/app/webroot/img/files/57655208466.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pojuzajupomuvovimisikuro.pdf
    • http://lnianemarzenie.pl/userfiles/file/batetuzesibawesudapolu.pdf
    • https://sieuthigo.vn/upload/ck/files/pumanigasuzurubu.pdf
    • http://adriennemason.com/assets/files/dumamar.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/fojefepamisitosazesoxo.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_off0000b20d.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 9076 bytes
font_01_sfnt_off0000c4ae.bin
3c9ce325707083f1ec78448b88f9a0d1ef2906ced03bd94bb343ff538f1a8b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 19760 bytes
font_02_sfnt_off0000f8f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes

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