Malicious PDF — malware analysis report

Static analysis result for SHA-256 7497c866624ec83d…

MALICIOUS

PDF

69.0 KB Created: 2020-11-10 18:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50c035cdefdc04c9f2fe471759d78dd SHA-1: d0685172cc51537a33c705863acf243ffbeaad29 SHA-256: 7497c866624ec83d82ac0e01e0108382acee1ba267ced1d742da5befeadbcf91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users, potentially leading to phishing or malware downloads.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?keyword=halo+3+armor+lock
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f88a5f442f40.pdf
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/pugezotumakagorus.pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_5f93f161cba37.pdf
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/rerazomibagin.pdf
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5fa7e71a72e6d.pdf
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f8f60b654aee.pdf
    • https://soxokelu.weebly.com/uploads/1/3/4/4/134494323/tibivid.pdf
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5fa07ebc38d95.pdf
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f9fa9fc8386a.pdf
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f92707839f53.pdf
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f9efc35aa9bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7794296-d4ba-4b10-86fc-eb473cdb7935/daddy_dom_baby_girl_stories.pdf
    • https://uploads.strikinglycdn.com/files/473fb506-675e-4650-b102-42e6b6f86843/kalel.pdf
    • https://uploads.strikinglycdn.com/files/0f3138f3-a068-40b0-82ec-d4d456d96dab/55210935989.pdf
    • https://uploads.strikinglycdn.com/files/2da31359-cc5e-4f98-a15a-05adaeca118b/new_colossus_walkthrough.pdf
    • https://uploads.strikinglycdn.com/files/e3f0371d-002d-4910-be8a-016f77c89a63/wuduxulurogidifab.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_off0000d323.bin
972988341eaef946e0144ea69cc35c947a3d4b4b126a04c94b7af43269a21432
pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 4956 bytes
font_01_sfnt_off0000e3e8.bin
fea83343757e48b97c2d262d2d26e69c8ccab106c34559833cb21977bb2c8adc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 10208 bytes