Malicious PDF — malware analysis report

Static analysis result for SHA-256 796b8113f3738ea4…

MALICIOUS

PDF

67.4 KB Created: 2021-01-10 10:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8445121c87f2582fdaf026e68c95bd68 SHA-1: d326c08cacebcf6e279601c2909c99a1d592bb8f SHA-256: 796b8113f3738ea442deff71b0d975a50768491b69d16d9b1646c891e9e9a2f0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'trafffi.ru' and a query parameter suggesting a lure related to a 'guitar lesson'. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. The presence of these elements strongly suggests a phishing attack designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=thunder+kiss+65+guitar+lesson PDF link annotation
    • https://site-1176659.mozfiles.com/files/1176659/how_to_complete_score_hero_level_207.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/SjijsE3/webitizina.pdfIn PDF document text
    • https://site-1166675.mozfiles.com/files/1166675/tibunawoduje.pdfIn PDF document text
    • https://site-1179389.mozfiles.com/files/1179389/dakabaturowokurujosuz.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/menerufamezupowuxurutoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5fbcc29e5dc4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_5fb43748550dd.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/xhb1geV/gunov.pdfIn PDF document text
    • https://site-1168513.mozfiles.com/files/1168513/xavakoteke.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/clezDjg/58038577651.pdfIn PDF document text
    • https://cdn.sqhk.co/talulofofexa/jg4ihhe/vip_nails_and_spa_near_me.pdfIn PDF document text
    • https://site-1083772.mozfiles.com/files/1083772/53113092807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_5f9050805efea.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/25795710321.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_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 5380 bytes
SHA-256: 4023375755aeda37783e7fa1b8d330e5ed34a00c5cf5adfb7d5c42b108a53b50
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10400 bytes
SHA-256: 04b2d032ca046db1a0d7b0f79cf02d093087fc68a3bef8913cb1bd10b21ba077

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