Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4ab122e6a69dd7…

MALICIOUS

PDF

68.0 KB Created: 2021-04-11 14:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b59d56352716d2a16307058ae3c7c87 SHA-1: 37457e793b46fd3fd8ada49b25fad2e6d41d3d3c SHA-256: af4ab122e6a69dd750393c1b2b1d35e819ef33d2addfe6ed1879742628963d33
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to potentially suspicious domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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 https://www.a1touchsolution.nl/sites/default/files/kobovigub.pdf
    • http://seiary.com/sites/default/files/webform/rec/pexutagizoniged.pdf
    • https://ambrose.edu/sites/default/files/webform/58588935603.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/welukugipevodabarovefeweb.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/32675510575.pdf
    • https://web.liderpapel.com/sites/default/files/webform/21411595718.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/71260674720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=o+silencio+de+ad%25C3%25A3o+livro
    • https://printandmail.princeton.edu/system/files/webform/67925993666.pdf
    • https://campusrec.princeton.edu/system/files/webform/putiwokareviwe.pdf
    • https://www.vub.be/sites/vub/files/webform/rifavuzido.pdf
    • https://lib.asu.edu/system/files/webform/61431168480.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/87767597376.pdf
    • https://lib.asu.edu/system/files/webform/98562832035.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cf.bin
4899956932eb794bd17fffcab9fb9c68f439c9f314834ab230c7e56fbbb88eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 5340 bytes
font_01_sfnt_off0000e974.bin
70ee5ea794c8c9a65a01576a4d4731661daf748f38d648d976186cabd8ce4355		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 13512 bytes

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