Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c25fa926ab0e924…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 22:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1eca5e2ac4096ceec810fca0ceb4bc5 SHA-1: b1f898d9786a40c2496b4ef4aaa0690c78bf04d5 SHA-256: 1c25fa926ab0e924dffec764c3b14d803cd96ba4e81cd4b168c78f94d840c120
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 or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://adtw1.elfjane.com/ckfinder/userfiles/files/91315630725.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/47961208764.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/72967543790.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/vudodukeliwofo.pdf
    • https://pointvirgule.ca/upload/editor/file/4140820899.pdf
    • http://iberia-ex.com/images/blog/file/27545639297.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/tapige.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/58225451127.pdf
    • http://m2m2design.com/userfiles/9640227733.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/taminijamesegutagibozino.pdf
    • http://dae-young.kr/upload/fckeditor/file/96631423466.pdf
    • https://ipekyolumedya.com/resim_galeri/file/suwagitipasarapejajiz.pdf
    • http://www.pattyn360.com/upload/forum/files/gexirofijilefirugos.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28bea10a92a8f41255c5b7efc9c93e8d/96894255536.pdf
    • http://zhatuogz.com/uploadfile/file/39381572668.pdf
    • http://stopguepes72.fr/userfiles/file/15956069195.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/41439976706.pdf
    • http://hoangduy.vn/vn/files/tolizegipodonopuzotikiro.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36f5588cd---56434916378.pdf
    • https://komunalno.vrgorac.hr/files/xuwisinokomuduj.pdf
    • http://kdbelektrotechniek.nl/uploads/file/dufatixisa.pdf
    • https://whitesal.com/data/images/file/1985_20210914112036.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=redecor+home+design+game+mod+apk
    • 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_off0000b3ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FF 16792 bytes
font_01_sfnt_off0000cc16.bin
1c2fb839ce38306e8e49717de3dc15d7dcf122c21695412b9da42ab3afe1a46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 10952 bytes
font_02_sfnt_off0000e50e.bin
3dbfc1befa3deda39475a66caab29d4cbbc5672157f2f4cefa435b69c7c51ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 15460 bytes

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