Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0ee19ba2dea160…

MALICIOUS

PDF

79.5 KB Created: 2021-04-28 07:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c9739a5a2a9de293541b4b62f63ece3 SHA-1: 75000d73fc351622334c5bbbdf2c47a34777b42c SHA-256: bc0ee19ba2dea160bb7db3203e3e26acf6c3f47e7ca9e63697aef1eec4b3441c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on `https://dafemum.ru/strik?utm_term=literal+equations+solving+for+e`. Heuristics indicate this PDF is a link farm hosted on disposable domains, designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=literal+equations+solving+for+e
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/5014097.pdf
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5fee8e944818b.pdf
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/sopemaniliro.pdf
    • http://wekabamile.22web.org/33981365066.pdf
    • https://cdn-cms.f-static.net/uploads/4422912/normal_6045148173d28.pdf
    • https://cdn.sqhk.co/mufipofunup/hp3CEia/21400441152.pdf
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fe9f758932d2.pdf
    • https://cdn-cms.f-static.net/uploads/4476285/normal_6011ee927105d.pdf
    • https://cdn-cms.f-static.net/uploads/4420917/normal_6061a284c9423.pdf
    • https://cdn.sqhk.co/xibetevoxaj/idEN7Lv/risk_probability_and_impact_matrix_pmbok.pdf
    • https://cdn-cms.f-static.net/uploads/4408720/normal_600bf05c2d223.pdf
    • https://cdn.sqhk.co/mofipife/hhjaKhh/tasomotolitemenowixef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mulagokonud.rf.gd/cnc_milling_cutting_tools.pdf
    • https://uploads.strikinglycdn.com/files/1daa0ea8-bf02-490b-ae19-3fc1c2f0ddcd/xepazomipatiwibaze.pdf
    • http://xoxinazur.rf.gd/62110046703.pdf
    • https://uploads.strikinglycdn.com/files/0b64507c-f9f1-464a-82f8-459ee8f42b81/john_deere_2653b.pdf
    • https://uploads.strikinglycdn.com/files/6b35d699-186f-4890-8eb6-a6f25efba777/does_the_red_cross_test_for_covid-19_when_you_give_blood.pdf
    • https://uploads.strikinglycdn.com/files/bdb22a91-4154-4981-b756-92162b82848e/why_is_my_wii_remote_not_charging.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_off0000f905.bin
7f6047ebca1b478a6526ace9a6ac57e612dffa094d20382156f93573b5ab211d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 5064 bytes
font_01_sfnt_off00010a5a.bin
5df916f0a212f3d8fb7f941e9eed3e573423e400b5735badc05b586221eee9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 11344 bytes

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