Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dd90cc39742811…

MALICIOUS

PDF

84.6 KB Created: 2020-11-27 12:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9045f56aaeb48cb71bf8d5b0084f0dd SHA-1: 1bee5f4299407c9db917d5fec264c89d545b1773 SHA-256: c6dd90cc39742811141834ddc5d2531dd167b330ad691a07ffdf389ae55c33d9
242 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external PDF documents hosted on various disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The presence of a known malicious redirector URL further supports a malicious intent. ClamAV detection as Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0 confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6349

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://gettraff.ru/aws?utm_term=fairy+tail+episode+guide+season+3
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/5936870.pdf
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/mepoxabibexiwo.pdf
    • https://sozeberanula.weebly.com/uploads/1/3/4/7/134774269/lexidigowapo_degosexenoj.pdf
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fa620eca541f.pdf
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5f9d6ce630b4e.pdf
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/fefixiladedawifa.pdf
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/4464611.pdf
    • https://cdn-cms.f-static.net/uploads/4470408/normal_5fa9ff2b8287a.pdf
    • https://uploads.strikinglycdn.com/files/00026183-1f4d-49d5-8507-6529478a8680/batagobegorekamodera.pdf
    • https://uploads.strikinglycdn.com/files/2922377b-5119-4155-8ddb-344900b904d7/viwalodedoxarilodike.pdf
    • https://s3.amazonaws.com/zetare/56486636263.pdf

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