Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3191161f62ceb4a…

MALICIOUS

PDF

69.5 KB Created: 2021-03-25 12:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b8deeac9915ab3ad1c686aa688b7c8c2 SHA-1: 197aaa998881e8e1f81adb0e9d1f74900aef7142 SHA-256: b3191161f62ceb4a64f442cb6086598ebb8a4d8ae2d20aaa3031afa81e82567e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=what+is+a+good+a1c+for+type+2+diabetes', are likely used to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=what+is+a+good+a1c+for+type+2+diabetes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401711/normal_6050044986f32.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/how_long_to_cook_a_25_pound_turkey_in_a_roaster.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/belematit.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/bjaidii/bavafumunidakulojaman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_6014163eeb722.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/4010351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_601e4ade62a95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5feee1d1788fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_600b60dba1035.pdfIn PDF document text
    • https://cdn.sqhk.co/setawefuwo/jZjcUjd/semi_formal_dress_code_invitation_wording.pdfIn PDF document text
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/3be1e0.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/gfhghhq/dusabusudi.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/hkighf1/mountain_climb_4x4_stunts_offroad_racing_car_drivers.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/ddaf10638de3ded.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/xiwawabop.pdfIn PDF document text
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/nukedufas.pdfIn PDF document text
    • https://zivopelorikeder.weebly.com/uploads/1/3/4/6/134677217/zofevazujizobinor.pdfIn PDF document text
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/nadirebo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/ageNbuU/17639228290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_5960222e525c4d52817879c1fd0d8714.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_51cb4dc7fbaa4a92aa03c816a996b69e.pdf?index=trueIn PDF document text
    • http://tulifal.onlinewebshop.net/67393539997.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/pojebozewevojajejoviduwa.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/ingenuity_inlighten_bouncer_reviews.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 5824 bytes
SHA-256: 78db7b442048f4cfd4f1b38e04e9fa1c62be005a48489c03fab901dc5ab91210
font_01_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 11488 bytes
SHA-256: b7e227d13df2d2bf6a05ec4bbf5275a4be88b3e98246246f9ec8f049c6f64a33