Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e3cda937c11099…

MALICIOUS

PDF

79.8 KB Created: 2021-06-01 04:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ffa777475b6631e054ec2039e51ce36 SHA-1: d567173cf367e63f3f03cc674c7cf0fe873e58ee SHA-256: e5e3cda937c110996d159d88cda3985b6869d6681e5f612b06abd31dcfb13b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to an anime challenge, directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=what+is+the+one+punch+man+challenge
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fd3bfaec1103.pdf
    • https://cdn-cms.f-static.net/uploads/4482854/normal_6022a2d68d4fd.pdf
    • https://static.s123-cdn-static.com/uploads/4424646/normal_60039540b5dcf.pdf
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5ff5b1646e44c.pdf
    • https://cdn-cms.f-static.net/uploads/4386607/normal_600e7373d794f.pdf
    • https://butabapob.weebly.com/uploads/1/3/4/7/134744569/tufafozejosiged.pdf
    • https://cdn-cms.f-static.net/uploads/4375358/normal_6066313b716af.pdf
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/6486943.pdf
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fff640d1501e.pdf
    • https://gorixiboxizamo.weebly.com/uploads/1/3/4/5/134589430/7999320.pdf
    • https://cdn-cms.f-static.net/uploads/4423171/normal_605c70b2d31e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3315226a-28c8-4125-8370-28ba20385765/army_jcr_system_tm.pdf
    • https://uploads.strikinglycdn.com/files/287f582d-7e2c-41c3-841a-45836bb2579d/purple_cow_menu_fairfield_maine.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144411690/zefaseratujerituxidivu.pdf
    • https://uploads.strikinglycdn.com/files/18224dba-87b4-4ef6-8b9d-bc349b76b523/10924560844.pdf
    • https://uploads.strikinglycdn.com/files/94b49775-0948-4c83-9977-696cca3d82fe/pupefaparusasilovumasan.pdf
    • http://degenazi.pbworks.com/f/nofejexovusujumomumufasef.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144428070/8676377527.pdf
    • http://wozixokumo.pbworks.com/w/file/fetch/144435279/what_are_3d_shapes_for_grade_1.pdf
    • https://uploads.strikinglycdn.com/files/99a6f8fa-ed77-4058-8b84-a460058fcca2/invicta_mens_watches_near_me.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bd.bin
c4cb1e077bed5c120a97f95ff21c5c3d95110459dc9e02487a6681c620cc6a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 5264 bytes
font_01_sfnt_off00010892.bin
e5e68f21155142637a7e799412d7febc154ad74704e7c0c45af666e833e137d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 12720 bytes

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