Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1c280c73baf9f8…

MALICIOUS

PDF

68.9 KB Created: 2020-11-18 22:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edbb1db3d8a12e5fc316109962dd5ff3 SHA-1: 1b5bfe7b87679a42a35b5a928b52ee35cd42989f SHA-256: 0a1c280c73baf9f8f265edb9e32ef12d88c270902217dfd7591c485049e6c926
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, including one to 'traffine.ru', suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=math+3+final+exam+study+guide
    • https://cdn-cms.f-static.net/uploads/4425504/normal_5fa214349373a.pdf
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/050c863862.pdf
    • https://cdn-cms.f-static.net/uploads/4495050/normal_5fb2aa758c1ed.pdf
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f95f8e3cee48.pdf
    • https://cdn-cms.f-static.net/uploads/4413705/normal_5fa56b616e090.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f9435256a27a.pdf
    • https://cdn-cms.f-static.net/uploads/4411246/normal_5f9d8b7bda5ff.pdf
    • https://cdn-cms.f-static.net/uploads/4446374/normal_5f9f5ec287724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wisuw/cg_vidhan_sabha_list.pdf
    • https://s3.amazonaws.com/xijalovelokolep/moviesheets_contagion_film_questions.pdf
    • https://s3.amazonaws.com/fosalizuzu/36622936015.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce29.bin
98f859abdf0e450a7c49a0068bef71932df9e501a6fcc660cd8fa2c77517e440		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 5564 bytes
font_01_sfnt_off0000e11c.bin
b745e12052f17e5290a75d137faf1aad37003bcd392a4c669550ef2449197c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 10740 bytes

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