Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed253c501b4a5e3…

MALICIOUS

PDF

75.7 KB Created: 2021-01-01 05:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b480b1f42db37a0fa43b23638c5a5dae SHA-1: d9e959b65cc19db260a62217a75156bf3f095789 SHA-256: aed253c501b4a5e3757d7f0f8c4bf3ff52d9bc672ea846bb5c270acdf892041e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafffi.ru/123?utm_term=dispositivos+de+entrada+y+salida+mixtos PDF link annotation
    • https://cdn.sqhk.co/kimamena/ijmCgdP/halloween_hockey_mask_bulk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_5faa22392c98a.pdfIn PDF document text
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/ramaz_vaxotuvuga.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/peweso.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/1028354.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/jememokawewopi-vuwejix.pdfIn PDF document text
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/zaliluwenesijis.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/nd4ifji/23013198725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5f95df1d8b373.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/cMhaFIe/47677857880.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/chhgfjd/nemoloveze.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/kowegegos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f96dcc344765.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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 5336 bytes
SHA-256: 8672ba7c54ed89a4050f523534277748d5349b78f73be1ed0ee9e1a66306f66d
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 10656 bytes
SHA-256: b276d0b4171e9e078909ae413788bacf1364d591a052e897327b05d7694f9efd

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