Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4421b6f173a4a9f…

MALICIOUS

PDF

68.2 KB Created: 2021-02-11 16:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 56389d80a24e3ee8b60101cd927474c2 SHA-1: 50763abc1d8a42d3a9f105f8f3ebb3336c10a181 SHA-256: a4421b6f173a4a9fc779037bc4fd8e8ecbd730fd3c29a5bdd1fd84ff1da557bd
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=skyrim+se+no+mod+configuration+menu In PDF document text
    • https://cdn.sqhk.co/naketego/4ygjjED/princess_pretty_girl_dress_up_games_unblocked.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/kidumudidakuvakivero.pdfIn PDF document text
    • http://help-violation.com/guitar_tab_sheet_creatorq95gt.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/VheuiaW/teachers_salary_in_cleveland_ohio.pdfIn PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/5603388.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/8037780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fe9b89e35017.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/gfYHBhi/marco_polo_meetup_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/iXheghh/bijofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5feb252c72f26.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/duvesojugogujisob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464070/normal_600978a229b79.pdfIn PDF document text
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/xivosefobavalurak.pdfIn PDF document text
    • https://tilapenudulaw.weebly.com/uploads/1/3/1/6/131607943/1e293fc8bc26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_602227942fe41.pdfIn PDF document text
    • http://redpandarecycling.com/1609839281399xac.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/kotodur/33608975759.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/92665022954.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/derivative_market_in_india_project_report.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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 5580 bytes
SHA-256: 01da345866535b61a919f49e482d13cd23d01d1551c8e3fe86f4fa28d65f8741
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10128 bytes
SHA-256: 1a9cc6b8e7be9247f63324b2c463a79536e1a036590a39c8a7ba2945b9cd6d31