Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce5f77480512230…

MALICIOUS

PDF

71.5 KB Created: 2020-11-26 09:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5b0d437fd48ff07ddb6f2986e954900 SHA-1: d427bdf488b063cc08e1cf2aceaeb82a8e042bd2 SHA-256: cce5f774805122301347d82a3e4ead09da65d95b9c9ea0caedff0106182f247d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=exit+status+137 PDF link annotation
    • https://sazunanul.weebly.com/uploads/1/3/4/4/134488017/purozesutaxosuge.pdfIn PDF document text
    • https://dizazulebor.weebly.com/uploads/1/3/4/8/134882555/tetalizuketezala.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/gumizibinoxinul.pdfIn PDF document text
    • https://setekonireza.weebly.com/uploads/1/3/4/1/134131298/bunutudovutinuzud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f9b7323a229e.pdfIn PDF document text
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/bizuguzabisewa.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/tometubufimopim/just_give_up_robot_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13691f9-6fd8-4e4f-93b2-5329d2bbfe34/kuwulavuximeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/math_about_me_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/10010564816.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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 4872 bytes
SHA-256: 7b41f2c435e653afb821628241c551b0f9881892836ef4534fdefe1d2eed3ef3
font_01_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16032 bytes
SHA-256: 05552b96fcfa92a7a1221886e171189629664b00ca1b22057a5a3c1ccaff840a

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