Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfe56d8c9ca0ec6…

MALICIOUS

PDF

75.7 KB Created: 2020-11-20 09:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd2e15c3a5154053fcbd63f102f6e67f SHA-1: 3bbef8dd20376cfc10c9285001e2097f283b40e6 SHA-256: 8dfe56d8c9ca0ec63034477cc065852927644d9215c18a15b1e5f09b540d52be
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=2006+nissan+altima+repair+manual PDF link annotation
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/vizenulo.pdfIn PDF document text
    • https://wokugosag.weebly.com/uploads/1/3/4/3/134339956/b6a5726242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f87279008cd5.pdfIn PDF document text
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/6b7dd.pdfIn PDF document text
    • https://kobekasi.weebly.com/uploads/1/3/4/5/134588699/suxibagup_wujidoge_fijetof_fizibigemo.pdfIn PDF document text
    • https://fatanavaxiwakat.weebly.com/uploads/1/3/4/6/134606547/57d6fae778ae45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f914d6fc161a.pdfIn PDF document text
    • https://sikefaliwubu.weebly.com/uploads/1/3/4/3/134375420/ef7c9dbd3d87a3.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/lijufu-rugalipet-noxivor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9b295d-37e6-47a3-ad3e-75cc9f8d12b4/32534690586.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/opsc_aso_syllabus_2018_download.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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 5300 bytes
SHA-256: 5af6bca52229a2c8999ba881bfc26ea863d7ff38d98d8adba43fc9a67d71b262
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 11424 bytes
SHA-256: a0d517443753a1eb6af22cd552e846d03f93da60087b1c3122a67a2834797041