Malicious PDF — malware analysis report

Static analysis result for SHA-256 64238509cd88297e…

MALICIOUS

PDF

77.6 KB Created: 2021-04-18 08:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86fc5aea2bc399406c094641a8a27fa8 SHA-1: e457129ba286e1e3b7169929815310d38a6a06bf SHA-256: 64238509cd88297ea7044ac3249cb5f53d18403fe90693366ae80b1e9667c02d
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9273

Heuristics 4

  • 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 http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/40041164747.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/fukixuliwidopisoduzurapi.pdf
    • https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdf
    • https://www.termis.org/system/files/webform/776381217.pdf
    • https://www.woonsocketri.org/system/temporary/webform/makepepatamizozixijefawop.pdf
    • http://portal-mysigma.com/system/files/student-proof/tevesifisota.pdf
    • https://www.uts.cw/sites/default/files/webform/tidenopuzi.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/50635107556.pdf
    • https://www.jwico.com/sites/default/files/webform/pagijan.pdf
    • http://portal-mysigma.com/system/files/student-proof/62332338419.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/5308316073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tal%2527dorei+campaign+guide+d%2526d+beyond
    • https://campusrec.princeton.edu/system/files/webform/putiwokareviwe.pdf
    • https://lib.asu.edu/system/files/webform/85824103047.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/77241298986.pdf
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012612.bin
c81928b18e8672f083e4b98a81f130e4f682d0c4bb158e701354797447208bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 5196 bytes

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