Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5db95ae0931068f…

MALICIOUS

PDF

72.3 KB Created: 2020-11-19 15:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b64f599974c0eda30aa5f9b1062ba1dd SHA-1: 1cd71e1562753c28ec46a5606b9c35e9bb9e8a02 SHA-256: a5db95ae0931068f6ff84f00e9ac098b09cf120f6a89e7240a3ae7d3d7b2c5e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://traffnew.ru/strik?utm_term=mercedes+benz+ml350+manual', appears to be a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=mercedes+benz+ml350+manual PDF link annotation
    • https://wuripofowiwafu.weebly.com/uploads/1/3/4/3/134332549/2fb556e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f88f8ec4ef97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fb672dc3035e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/berif_jikobuzef.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/35d1cd.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/sixukejomiwewanage.pdfIn PDF document text
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/suzigo.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/2002838.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/kavitokolezub/29619618482.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/wedding_ceremony_planning_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc53aa4c-f7f7-48fb-8bd0-dcd8c26e0c41/final_fantasy_fables_chocobo_s_dungeon.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/2951385876.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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 5712 bytes
SHA-256: 766dc6429ed712dc605a77b909115b0a7d70448045835c3fd81c9f6408b78251
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10032 bytes
SHA-256: da6bad90739773a930096f333c671f947dab96e8a9aa8ee68e0c3d8886ebe98d

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