Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b685ce3673a04c3…

MALICIOUS

PDF

68.6 KB Created: 2021-04-04 02:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d3ee20c068650a3c8b884d15e74ea2 SHA-1: d577b9b65ef57a44631bd5df619dd28ef9ddaf4f SHA-256: 2b685ce3673a04c37a1f0d4419c7c2fa404612c20e473ecdfdf9910b7b0b882d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a potential SEO link farm or a phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

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://resalured.ru/award?keyword=anti+ragging+form+for+student+pdf
    • https://cdn.sqhk.co/vusunuvaka/p1lV9cg/defence_science_journal_author_guidelines.pdf
    • http://idealica-official-it.website/how_to_look_up_my_florida_drivers_license_numbernr0yr.pdf
    • https://cdn-cms.f-static.net/uploads/4379859/normal_60309822e0326.pdf
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/4a5283f4aa0f512.pdf
    • http://babblescoop.store/mekajixabowisi4j4k8.pdf
    • https://cdn.sqhk.co/mitajaso/heieUcG/8510006716.pdf
    • https://cdn.sqhk.co/xelalizogim/jiXijia/bolika.pdf
    • https://guwagigiruf.weebly.com/uploads/1/3/5/3/135303004/2597361.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5fe6a7912f8e5.pdf
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/a79c791.pdf
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fe3fa7b9a98b.pdf
    • http://dirupomavi.iblogger.org/simple_algorithm_examples.pdf
    • https://static.s123-cdn-static.com/uploads/4382414/normal_5fe57d0823e72.pdf
    • https://cdn.sqhk.co/vujejanar/ighajed/cute_puppies_and_kittens_pictures.pdf
    • https://cdn.sqhk.co/tamejenonisi/janjehh/69013809245.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tituvuten.rf.gd/45977676182.pdf
    • http://muvalinifotu.rf.gd/automobile_engineering_nptel.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_off0000cf2d.bin
e88422bcaaad467b11d438ce47b2b8da9d9d54ebc9197dde939d3af8b6edda4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 5320 bytes
font_01_sfnt_off0000e133.bin
04a0a7695a28f9874f23284d40d720efcb415c9779af0b41b193e46db49a826a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 10600 bytes