Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bb9f926da77829…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 23:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3ecfd7fd0e190832579ed18cdd31e619 SHA-1: f896b3a5c71ab74c1874232c984ea6c066df7642 SHA-256: a6bb9f926da77829b31a6f5e02ddbe0fd61c478f5669233f08ce4148d5b9cd87
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://vilenefex.ru/wix?keyword=elkay+water+fountain+ezs8l+manual PDF link annotation
    • https://cdn.sqhk.co/zimuteraf/fgcijia/38574322097.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/john_deere_gator_parts_for_sale_uk.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/do_weight_watchers_scales_need_batteries.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/ohio_common_core_standards_math_8th_grade.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/bavubefaro.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/administracion_de_medicamentos_por_via_intramuscular_ppt.pdfIn PDF document text
    • http://whysmall.space/nobatezobuvixevum55t0.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ehbifhc/minecraft_gamepedia_paintings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ff0dd704703f.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/eNhgjhg/gildan_hoodies_wordans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_600f255f4dc17.pdfIn PDF document text
    • https://cdn.sqhk.co/bikezuku/T75jfVD/life_is_strange_comic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 5372 bytes
SHA-256: 4a3cc325bf6ec5dca5e9936a43e5ef8b7190a7cfa4dbf15ea20166955f39d540
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10988 bytes
SHA-256: 7da0b143bd58f2901a87509cabaac9f8c8db365c7ce06fd1f9909adcd685ac3f

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