Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18e8c8b1b91595e…

MALICIOUS

PDF

69.9 KB Created: 2020-11-26 03:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 41f9b9d34f91e1cb3e712d7d0aaa8586 SHA-1: 4c3c7001de0231bced3909a82521de8ec2969d71 SHA-256: b18e8c8b1b91595e2aff1d5b22d9049774fe6e9f08b1df1c5ead4a933de71ec6
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. The primary URL, 'https://traffnew.ru/strik?utm_term=soccer+head+game+champions+league', suggests a redirection mechanism likely used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://traffnew.ru/strik?utm_term=soccer+head+game+champions+league PDF link annotation
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/liwanufiw-rolasabebuloze-xarenu-nejizurol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_5fbac13faa8f7.pdfIn PDF document text
    • https://litulivugaz.weebly.com/uploads/1/3/4/4/134463412/7466424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8c0e429d62a.pdfIn PDF document text
    • https://fowimuwejagun.weebly.com/uploads/1/3/4/5/134529075/2212850.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/xedudosazijogi.pdfIn PDF document text
    • https://galafiki.weebly.com/uploads/1/3/4/3/134347291/vaxexek-kenexidoz.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/1073481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f91daf6627f0.pdfIn PDF document text
    • https://jumobagovuv.weebly.com/uploads/1/3/4/6/134697352/2619289.pdfIn PDF document text
    • https://nofevezim.weebly.com/uploads/1/3/4/7/134770192/aa5f2b61472336.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/4779585.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/laniwo_larobudo.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/gokonuzabewareboteme.pdfIn PDF document text
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/getixewapetid-pawemani.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/gosete/17746711187.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 5592 bytes
SHA-256: e336580697c71c5d6ff7abf33be3aac637a70ab4e0122a92dfabcb03e4e6bcd9
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 10176 bytes
SHA-256: 0e1d7972a8f8afe71eb1d97eb409352038f1af354309d658ccaf563d4924538e

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