Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a76409e6ed82e6…

MALICIOUS

PDF

80.9 KB Created: 2021-04-06 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b6f943e8ba74cf6336d27b1b52795be5 SHA-1: 9968326ab0be890aa421a72b99999f8ce3f451c0 SHA-256: 00a76409e6ed82e65d7cdfa85d7b964600ac0a5d1f26ce42f10b24b1cc87afcc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards a tactic of directing users to compromised or malicious web content.

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
  • 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://jumiwimov.ru/strik?utm_term=kiss+the+rain+yiruma+spartito+pdf PDF link annotation
    • https://cdn.sqhk.co/rodoruwuwab/fhiifWg/freedos_installation_guide.pdfIn PDF document text
    • http://itmax.info/what_was_the_mesopotamian_religion_calledgfx1x.pdfIn PDF document text
    • https://cdn.sqhk.co/livujiguf/PLOajcY/junesur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_60592b934af55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fd0e74898a60.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/djZhbgj/nasal_spray_for_sinus_headache.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/82gfShi/86580330120.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/ttZicic/585011844.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/icq8ge0/lisivis.pdfIn PDF document text
    • http://whalesqpa.fun/somenusemiregenanazovefapd05v.pdfIn PDF document text
    • https://cdn.sqhk.co/vavapezami/a4ic76I/likulopirebomigagidene.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/AXhiITo/10176596886.pdfIn PDF document text
    • http://circulyarkadigital.xyz/vingroup_annual_report_2019r0h8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_ece7e48558564cc18fa09a38a9128b1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somisilegex/55755618176.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_47318160db2e43fb873cee616b569eb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/how_powerful_is_homelanders_son.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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 3136 bytes
SHA-256: 635881881c4ff31f24486e454424876fc2c437eb84265756d99492aa0a4f79f7
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 5320 bytes
SHA-256: 1a85a3570690f254870b18f4f21235957e684859533bbc756fbd60f51f91c4f2
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 11440 bytes
SHA-256: 042108a5f180f38eb43b4e8d433b1110e8c3d0703cfbce5875001fb1db2a355e

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