Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe418be7db4e123…

MALICIOUS

PDF

62.7 KB Created: 2021-03-28 01:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2f54eeabd2fa591f7b03eb55b79cd86 SHA-1: a5980f6992b1bad3adbd4443b32acf02e88e0ba9 SHA-256: cfe418be7db4e1239617000d07341e6bf31574d3f58e2d726dc34d7364c1159e
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9045

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/award?keyword=certificate+template+pdf
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/jagevu.pdf
    • http://fujigukatujewu.medianewsonline.com/32790968216.pdf
    • http://ganedoxumizaj.sportsontheweb.net/coway_ap-1512hh_filter_light.pdf
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5febd053f3df9.pdf
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/xivis_zulutijo_wagojo.pdf
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/1459537.pdf
    • https://static.s123-cdn-static.com/uploads/4376879/normal_5ff137c7ad8ca.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_604f2d569a25d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujixus/34937734030.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_c275baf1373347638be572e67ee799eb.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_397a038ed02a42a987c217c945ef4208.pdf?index=true
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_3b18336440204c388eb6936dea463cb8.pdf?index=true
    • https://s3.amazonaws.com/patilawasu/reralinelupajulus.pdf
    • http://vekabun.myartsonline.com/1580556807.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_bd91c7303e374d42a3d82409a71feb74.pdf?index=true
    • https://s3.amazonaws.com/wipotegadodorek/47949562414.pdf
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_92de9b1c75de43b1ab7ece739d24b7b8.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae8.bin
3db71ec7dc30150aca8a5e4255e25ebd13e16971ce90f899c0f3a94833da224a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5028 bytes