Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec36b21026623c78…

MALICIOUS

PDF

79.6 KB Created: 2021-03-11 17:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cc2db42b395465ff824c4950aad063d4 SHA-1: a560f076ef77215dcb8a60206d41e9a4d5f9fe02 SHA-256: ec36b21026623c780ad14888141e06b1b07146483116e70b995adab5b71f6f3d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it functions as a link farm hosted on disposable domains. The primary malicious URL identified is vilenefex.ru, which is likely used to redirect users to phishing content or download further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://vilenefex.ru/strik?utm_term=what+are+basic+life+skills PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5fe15ebde1e90.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/widmfqV/neon_ball_rolling_game_cool_math_games.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/a45335c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530151/normal_5fd3b1558063c.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/4212496.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/pilotaloxirofije.pdfIn PDF document text
    • https://jirilerimu.weebly.com/uploads/1/3/5/9/135967849/d30e1a73e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407986/normal_6006331790ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6022cbedca029.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/7035555.pdfIn PDF document text
    • https://cdn.sqhk.co/buzodafevuj/nicjbie/94979641503.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/hgqghig/on_air_neon_sign_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/kowumutajaw/3gfih1g/56214946029.pdfIn PDF document text
    • https://cdn.sqhk.co/busudijul/ibhhigN/xavezogipidemakufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vetamedisoz/kizagiledowixu.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_3a66ed1b19e6420e8c8885ace028344a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/adobe_audition_3._0_32_bit.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_8c76b161fb2341e187f20e287a584d46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2619abad-7ac8-44ec-9751-6e68b3d31089/technics_sl-d202_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d014862-8607-4955-8f61-bab94f47bfa3/what_is_the_price_of_starbucks_coffee_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/question_words_in_spanish_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ae8205-b642-4629-ab9f-cac0ea8f93fd/76656037699.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_627956fd0cad400b86d658e069c31272.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e70719d-877e-41e3-8533-9a7494d30a51/what_are_the_three_fundamental_principles_of_informed_consent.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_1192e2f9fe0540138886ebf5c989cf7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/84361342262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c7996d-a1ee-47ee-9d18-f0fc1653668d/apollo_twin_x_quad_thunderbolt_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/gizabijogarelupobozil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 4756 bytes
SHA-256: a27f5227de6d4fa50aa43a7d6466e69d0f677e76e604abe8f6509f1fbcc0afeb
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 10568 bytes
SHA-256: 5ef575ec406f4e568073589c0b3219dbb98d06d35577e0af316400dc1afb35d9
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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