Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd35c6d23c12413…

MALICIOUS

PDF

61.3 KB Created: 2020-12-08 17:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94c8534067474d38bf441cc7393eec6 SHA-1: d203ce33ccd154feb32ef8c4f14804ae084fe97a SHA-256: edd35c6d23c1241330504eb8fde2b64ed5f253fa8c4134e0942a3d2828152690
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://trafftec.ru/123?utm_term=mind+wipe+ark
    • https://benaputilog.weebly.com/uploads/1/3/4/7/134707665/gajaxet_babeduwujolafo_pasatali.pdf
    • https://cdn-cms.f-static.net/uploads/4488103/normal_5fb760c0385fd.pdf
    • https://cdn-cms.f-static.net/uploads/4446394/normal_5fa6a40719d50.pdf
    • https://cdn-cms.f-static.net/uploads/4484814/normal_5fc24bb0ece2e.pdf
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/7186546.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8893d5a826c.pdf
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5fa2407d150e5.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fb56edd70f25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc014319-78a0-4875-ade6-9baa1160be24/kaxumelowalebunitegusesav.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_off0000b2cc.bin
ebf2a5c49efd2f89108b422a38a1d9fe8d9373e1744c1379cfc211d9c9a6a052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 4904 bytes
font_01_sfnt_off0000c3a9.bin
124f147fc5110da519027c0efb95951968d8c591c61c4409958273d79a61787d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A9 11016 bytes

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