Malicious PDF — malware analysis report

Static analysis result for SHA-256 3837e7761a543cb0…

MALICIOUS

PDF

52.6 KB Created: 2021-01-11 12:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 064c8143c4925d5ba098e815f4759866 SHA-1: 6260545284e90db27d0a84174520853f66ea053f SHA-256: 3837e7761a543cb055284d93101e266f9f881e814be44c1d0c30017c2c46c747
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs pointing to potentially malicious or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely involving the execution of embedded JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6098

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 52 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://trafffi.ru/aws?utm_term=unc+academic+advising+major+worksheets
    • https://cdn.sqhk.co/desiruzag/CihhAgG/xinajirigulagelura.pdf
    • https://site-1172776.mozfiles.com/files/1172776/topps_champions_league_museum_2019.pdf
    • https://site-1172364.mozfiles.com/files/1172364/star_wars_jedi_fallen_order_2_trailer.pdf
    • https://site-1174025.mozfiles.com/files/1174025/sweet_home_story_game.pdf
    • https://site-1172118.mozfiles.com/files/1172118/boy_hairstyle_long_on_top.pdf
    • https://site-1200530.mozfiles.com/files/1200530/engineering_report_literature_review_example.pdf
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fb5cf4b1fd70.pdf
    • https://site-1176302.mozfiles.com/files/1176302/genoseb.pdf
    • https://cdn.sqhk.co/numanazolov/jiagdI1/nike_sky_force_3_4_grey_fog.pdf
    • https://site-1184137.mozfiles.com/files/1184137/50390102372.pdf

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