Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e955aef7824561…

MALICIOUS

PDF

59.4 KB Created: 2020-11-16 19:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aec518b8f14050cf0776b0037ca4bf42 SHA-1: 50031dec907dedd8abf6ae6f0882cde8df8173ae SHA-256: 72e955aef7824561e926e8dafc5ad575efdf6ea96525b38283770992461a0b1b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, identified as a PDF link farm, with a primary suspicious URL being https://trafffe.ru/123. The presence of these links suggests an attempt to redirect users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=the+treasure+of+lemon+brown+setting
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f88cfc12627f.pdf
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f8eb38d7a746.pdf
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5f8e1d8c6f72c.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5faa21873f300.pdf
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f9687a87251a.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f96008bd4d48.pdf
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/mufafomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d0f59a4c-99e1-457a-84d6-a6c02347fa25/pesuzuf.pdf
    • https://uploads.strikinglycdn.com/files/41ac7bc0-0025-48dd-a686-ec14648311dd/11070238233.pdf
    • https://uploads.strikinglycdn.com/files/2a502900-a722-487f-805a-b2a298971a89/42206159465.pdf
    • https://uploads.strikinglycdn.com/files/fe5c8f26-496e-4569-b2fb-fbeef76adfb0/64860267523.pdf
    • https://uploads.strikinglycdn.com/files/d3420f4f-b2ee-428a-85bb-4e1e4e986786/mingling_of_souls_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/a50d4006-b0a8-488f-b669-65fe72141504/13871329207.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_off0000ae04.bin
26f8ebe5278d62d0a68e07f4e4e8c7d4c31899638004d781dbd8fdbf0a8c5e29
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE04 5364 bytes
font_01_sfnt_off0000c028.bin
5c32a44980e1b96ba7faf046b84d9891fa4b345cd7eecaa78ade81d1fcbf9eec
pdf-font-stream PDF embedded font (sfnt) at offset 0xC028 9648 bytes