Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bc91553fa3c94c…

MALICIOUS

PDF

91.4 KB Created: 2020-11-14 20:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 864e1b99421a38d647e7ae54d9204eea SHA-1: c82854f5367b4c44a132fe83a82aacfffe4bb265 SHA-256: d5bc91553fa3c94c96682c5811652a44aac162b123e13ff70dd924e914e96fb3
242 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external PDFs hosted on various disposable domains, indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged it as a link farm on disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, likely for SEO manipulation or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8735

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://ggtraff.ru/aws?utm_term=meaning+of+local+government+administration+pdf
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/peveratemosagiso.pdf
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/a353bc3.pdf
    • https://legawugo.weebly.com/uploads/1/3/4/5/134509979/gaxav-valozumoluga.pdf
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/dupatopuf.pdf
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/7020143.pdf
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/tiviwisomevenu.pdf
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/ea7d6752558d5.pdf
    • https://cdn-cms.f-static.net/uploads/4444371/normal_5fa8339ae9789.pdf
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/mowaremugurapewav.pdf
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/9927719.pdf
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f9c777a43571.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/5c449b3b0cd.pdf
    • https://rovemijiv.weebly.com/uploads/1/3/4/3/134343091/funolujobikojup-duzotewar-wimotu-worebu.pdf

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