Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cbf00a607a5cd5…

MALICIOUS

PDF

75.3 KB Created: 2020-11-25 02:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0dc1e218009bbd633b19f22510e798eb SHA-1: d24c78c26c533337d704f8db90fddec843f0d643 SHA-256: c8cbf00a607a5cd5bc93debcc7bae6ae33ab08e33f83f83af61a248acb8ae689
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link to 'trafftec.ru' disguised as a worksheet answer key. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic point towards a malicious document designed to redirect users to potentially harmful content.

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 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.
  • 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://trafftec.ru/strik?utm_term=chicken+wing+dissection+lab+worksheet+answer+key PDF link annotation
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/najepejotefepitujuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5fb351569efd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5fafc0cc31eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5f9a755624cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f8b4c0d6f87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fa6b30d4698f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fbd918b3b8c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fa41d3fd75a4.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/nafoxuda/was_kennzeichnet_die_absolutistische_herrschaftsform.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/dujomofubenag.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/mimoluvorim.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/2001_coachmen_clipper_pop_up_camper_manual.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5504 bytes
SHA-256: 373da0dbc5d2ec80ad3cb66bfff542445f98ed5ffbd511b5b94770161ef02318
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10004 bytes
SHA-256: 57b671b030d935c8d8ae3041f9f384cd4a160253bb6c4394709798080fd5389b

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