Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bdd47499d386e6…

MALICIOUS

PDF

75.3 KB Created: 2020-12-21 20:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4684a557d8e736d910bf28a531d0a6db SHA-1: d1434765d3426f9151f9153fb215d0905102754a SHA-256: 41bdd47499d386e657c099fa8387f72eb4a084ee60cfe2d5d3ae7f50c55efced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a phishing or content-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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://traffset.ru/strik?utm_term=car+racing+suits+near+me
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/vativagutake.pdf
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/pufepebewuzepob-lutile.pdf
    • https://tuwukodazoj.weebly.com/uploads/1/3/1/3/131383678/8478209.pdf
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/7807893.pdf
    • https://dufamapa.weebly.com/uploads/1/3/4/3/134399252/fiwosi_soxuxanabibekuj.pdf
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5fb74dc8ca0af.pdf
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fa468d8f2c8f.pdf
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5fc9078a5a9b4.pdf
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/f6543d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejenosugede/kivuxedomu.pdf
    • https://uploads.strikinglycdn.com/files/ceaddc98-a83b-4922-92f5-fcf7db7ac9fc/luruvotaso.pdf
    • https://uploads.strikinglycdn.com/files/7619a2da-b25a-4125-8726-712917c62389/rabokepozipadu.pdf
    • https://uploads.strikinglycdn.com/files/bd38f5bd-beb6-495a-9892-e0cb04ff6cb7/emotion_shiota_second_edition.pdf
    • https://uploads.strikinglycdn.com/files/af726e4e-d992-4e7d-beae-14a5f3a78a87/73806951988.pdf
    • https://s3.amazonaws.com/tipikaxe/9097361864.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_off0000ec68.bin
21a5990a8028acb891a98680c7aa8b87795b7e98004c45962049c2ec32317bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 4992 bytes
font_01_sfnt_off0000fd4a.bin
177d2af48dad5f184d46cc8e21aad598801ead17de3e745722144d255a7edf89
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 10368 bytes