Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6017405271f84e…

MALICIOUS

PDF

72.0 KB Created: 2021-01-01 06:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1a9ea5d97ea703de6defecd4bd5c58 SHA-1: 73d973fe99f1c42923496f130efee563b2ceb117 SHA-256: 3e6017405271f84e6dfada50348557ffc7dd299bd0082e3f13687cd949b13c97
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a benign document, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=word+family+games+online+free
    • https://cdn-cms.f-static.net/uploads/4503387/normal_5fd1e28e575db.pdf
    • https://cdn.sqhk.co/xobanozizesa/uZahioy/craftsman_new_homes.pdf
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5fa2c3deb1efc.pdf
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/6013b.pdf
    • https://cdn.sqhk.co/sejujona/hjshcgc/38846699394.pdf
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5fe4bf7dddffa.pdf
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f88f6cf1ea49.pdf
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fd1aa4fd0559.pdf
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fd66285342ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7f344c78-a85f-49e2-907f-34551b9dc665/69413714199.pdf
    • https://uploads.strikinglycdn.com/files/93c526e7-71da-4e77-b865-c4a84e50649b/fobelavu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a2.bin
da7ae22ec839615b0ec79054a718336d3d8f5f428e2dab7f143a838766234979
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 5052 bytes
font_01_sfnt_off0000e3c2.bin
1a0ca56be1472d7ce75a3586badfcee688a2171442508257bda7911732ba8346
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 9820 bytes
font_02_sfnt_off00010570.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 4324 bytes