Malicious PDF — malware analysis report

Static analysis result for SHA-256 39694aa2698d1d3a…

MALICIOUS

PDF

79.2 KB Created: 2021-04-23 08:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61e2167a6beaaceee9247c22d98bf3fb SHA-1: 06f99a4d4922e70df917f8fd6ffa1486191ad739 SHA-256: 39694aa2698d1d3a375ffed89359f341f6097c3d151a331214d58df7d618530f
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is dafemum.ru, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9095

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://dafemum.ru/strik?utm_term=how+much+is+a+polaroid+camera+worth
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6064816343fbe.pdf
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5fd8d8eeebd96.pdf
    • http://sunufosabupes.scienceontheweb.net/4003381292.pdf
    • https://cdn-cms.f-static.net/uploads/4408479/normal_605eea8526751.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_602376aa66545.pdf
    • https://static.s123-cdn-static.com/uploads/4401546/normal_5fec582ab3b4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_a735ed98e4f84133982a16c4b1b04cf8.pdf?index=true
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_95415dd274f64eb890fc7c5f998fc191.pdf?index=true
    • http://peledopa.myartsonline.com/7457686336.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_dc441094e0e84b51a5fcf06b92dbf02f.pdf?index=true
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_91783d6080104792bf83e256f5e04f45.pdf?index=true
    • http://jiroribi.epizy.com/telemupixal.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_491eed99fdd44c73ab0ec92c4d86ab94.pdf?index=true
    • http://newemepakirid.myartsonline.com/92383469674.pdf
    • http://zexukojol.rf.gd/fupen.pdf
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_56dfc754e754463383c0e71bf1b49422.pdf?index=true
    • http://vejimugar.epizy.com/onedrive_android_sync_pictures.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_08186b67a7494c579f6daee410d23204.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100bb.bin
f946e29a44f31a9333fb24c9720598e6f8cc79a5cad5cffb8b292986c20281ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 5144 bytes
font_01_sfnt_off0001123f.bin
68d174c60f49204c906a3ce0c1f783fecff37a7f2a6d038b4cab2922affb3481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10948 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.