Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3e24269766e447…

MALICIOUS

PDF

68.2 KB Created: 2021-04-04 20:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de09ddf1ec18f207010ce5a2773c7736 SHA-1: 7b670ea627e4c409c564b2a3c0868c3888d5b7f9 SHA-256: ea3e24269766e447b774cd3343a48700a03387a6522cbe5f7ccf783c5625c286
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable one pointing to a disposable hosting domain, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a deceptive title, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=bus+driver+killed+in+spanish+town
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/godexejelajujuri.pdf
    • https://cdn.sqhk.co/gujipiror/hejiN4i/earth_now_and_then_essay.pdf
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/4087088.pdf
    • https://cdn.sqhk.co/mixaluwekitu/aoaNqgg/gipujojegoji.pdf
    • http://berasowugixo.mywebcommunity.org/movie_maker_free_online.pdf
    • https://cdn.sqhk.co/jabisopomuxo/1hdBxkW/35094786005.pdf
    • https://cdn.sqhk.co/lukuvekeliki/QOEjehf/after_burner_climax_xbox_360_rgh.pdf
    • https://jumosoguwakebak.weebly.com/uploads/1/3/4/5/134588816/8974865.pdf
    • https://cdn.sqhk.co/posuwumujome/ifdANN6/nervous_system_worksheet_grade_5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sitozi/xotaju.pdf
    • https://s3.amazonaws.com/lixisariwulo/67200636022.pdf
    • http://tipokeviti.atwebpages.com/46284004611.pdf
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_1d89768a77634500a88f770949a7d567.pdf?index=true
    • http://molujafit.atwebpages.com/livre_arduino_francais.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_2987695d85b14946b134bc08050e9950.pdf?index=true
    • https://s3.amazonaws.com/xesigeze/94405910919.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_67c05ce78d814b23a1d275a1ef494868.pdf?index=true
    • http://zasuwunal.myartsonline.com/selenium_webdriver_java_tutorial_for_beginners.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_off0000cd02.bin
3145f0947a336587a7a27d9a2f14ebfae773754c05577b02d5cb0cb82e35fca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 5312 bytes
font_01_sfnt_off0000df21.bin
ec76b4aa478e3c7d1239fb1d9bc2b69e1dd0795d6a66f83143e38f9d4cefcc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10200 bytes

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