Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe880d15242fa7…

MALICIOUS

PDF

69.4 KB Created: 2020-11-18 10:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 179088faf885c78a5e81fe9f8d2f3ffd SHA-1: 2382d0594ca102a3e6877ba1fd4df3d1d8fbb361 SHA-256: 81fe880d15242fa78b6881ae5cc998b7070c5d455446a306ea9e29934ba24b86
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains numerous external links, with a primary focus on SEO link farming, directing users to URLs like 'https://trafficel.ru/strik?utm_term=bodybuilding+exercises+pdf'. The document body, though heavily obfuscated, suggests a lure related to "Bodybuilding exercises pdf". No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=bodybuilding+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f87799f22994.pdfIn PDF document text
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/vufopedinital.pdfIn PDF document text
    • https://sijazeresivex.weebly.com/uploads/1/3/4/5/134502522/8484021.pdfIn PDF document text
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/vematibubelifu-nujub.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/siwav-gobekeruf-vobaxerobidew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cd3e69-e188-47d7-b78a-4998945efe2a/68867491530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44551bd-e7fe-4589-9fed-2686974bf4a8/ballistics_theory_and_design_of_guns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c962fa1-2a47-4f1a-aeb0-924948fc14c8/guboxojeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce1cbaa-d657-40cb-a0fe-0374b2f2a554/8578899548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2e052a-1cb7-4083-a8cd-e27c58200819/fnaf_at_the_krusty_krab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53aaa3f0-6684-4f20-8b58-0247d4db2bcf/xejigojito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6433ce-e42b-4ec8-ae84-d45822e87028/janobasozuzinizita.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 5472 bytes
SHA-256: 49bc4b027568a05d324b48fabfcb063b9337ac57cb2dbab3c571924fb919523b
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 10564 bytes
SHA-256: 792a9e9d3cab2557331a2f3913790aedb37b49a751a2b4fb9058bc2a8e6d6b80

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