Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ec52153f12b3b6…

MALICIOUS

PDF

69.4 KB Created: 2021-02-15 09:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 742d1e3c6ff2398560acb587879ca621 SHA-1: e95878226287df44625bc3446c4d4384083aeed1 SHA-256: b1ec52153f12b3b6e615713eba027a991f0476f19c9ec766bf298585ec65df43
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services and employing SEO spam tactics. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://seumenha.ru/strik?utm_term=mikecrack+diamantito+3+cancion PDF link annotation
    • https://xexewevifiwewol.weebly.com/uploads/1/3/6/0/136054804/94158e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_6026dd19ad4de.pdfIn PDF document text
    • https://cdn.sqhk.co/tokejosanawo/bjimxg8/play_earn_money_app.pdfIn PDF document text
    • https://dimawirosaj.weebly.com/uploads/1/3/3/9/133997296/730686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_5fd3dce9dad66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_600ff9ee6bcd0.pdfIn PDF document text
    • http://excschool.ru/79585863426q1t8u.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/ggKsgi2/car_assembly_line_worker_job_description.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/0876112ed664f.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/4704868.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/jj5gjja/43638998446.pdfIn PDF document text
    • http://kindraretterath.com/vuejs_laravel_admin_template_nulledqo3za.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/Dijjhfo/decision_making_xbox_games.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/widarufejore_dofogab_wudamogike.pdfIn PDF document text
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/1d313cbaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_6023fd559ece2.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/8013855.pdfIn PDF document text
    • http://aslixan.com/better_start_funding_guidelinesujttt.pdfIn PDF document text
    • https://guxilidokuwog.weebly.com/uploads/1/3/0/7/130738661/dabavomagatanif.pdfIn PDF document text
    • http://persequen.com/tojagojamokuxowejifuzz3lt.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/zevivojinub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/75266170016.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/idioms_worksheet_for_grade_5.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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 5108 bytes
SHA-256: 01a7dc8502c897e99817f09618ee1c2434921670eadc161e389fab30d12a17a7
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 10292 bytes
SHA-256: 9592fcd935f5ebaed378ba8598f116417a98501804ff560e533fca2a91dc2cff