Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f248a1b95a6f25…

MALICIOUS

PDF

65.8 KB Created: 2021-04-15 12:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89f81ea7b9285a4ec13b82ada7c409fd SHA-1: ad183090792b293bd9bb85dfceaf7d98e156aa99 SHA-256: 65f248a1b95a6f25a460bef7e425754f2d4d53ff442775012b94248ccf74ec0c
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

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://cicatsalud.com/html/sites/default/files/webform/604022749.pdf
    • https://web.liderpapel.com/sites/default/files/webform/kivalin.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdf
    • https://www.a1touchsolution.nl/sites/default/files/dovav.pdf
    • https://www.blplegal.com/sites/default/files/webform/58709767715.pdf
    • https://aboss.by/sites/default/files/webform/31226501773.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/bulurifabisiwotubavigivos.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/35757612566.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/zizepuniket.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=m.+lippitt+%25281987%2529+the+managing+complex+change+model
    • https://printandmail.princeton.edu/system/files/webform/21338807989.pdf
    • https://lib.asu.edu/system/files/webform/liwubuwivak.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/63066688876.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/janoruzafasolefixos.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cc.bin
db64174453fa8d749bb67475ba9c44e6e4222f820c82f76301ca52419dd31000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 5956 bytes
font_01_sfnt_off0000ea20.bin
d2aff84f7790efe242d9de2108721fb3c46b3721511d292d0b7e0624a803eee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 10808 bytes

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