Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1da9fc9ccf408c…

MALICIOUS

PDF

65.8 KB Created: 2021-04-17 05:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e30b291240ec588c1422e78601301cb SHA-1: b432330a78d13c29e07646d2bf151cb2f7afc559 SHA-256: 6c1da9fc9ccf408cf8887a18e45a57d9cbc3ab8ea5b2efa7d7ddb334c1e53af6
124 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ambrose.edu/sites/default/files/webform/kubuxodadiwozubak.pdf
    • https://aboss.by/sites/default/files/webform/vobefoxejajizagosoberob.pdf
    • https://www.dgs-interparts.be/sites/default/files/42042694998.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/74543186253.pdf
    • https://ambrose.edu/sites/default/files/webform/zateguzafafidefezibexe.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/rarapenebeku.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/pulipalukegibivep.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/vawutudujenopudup.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/sabaw.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tatemomolefifepa.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/69774832497.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/86929885116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=learning+python+o%2527reilly+amazon
    • https://gradfutures.princeton.edu/system/files/webform/25860956451.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kozavexol.pdf
    • https://community.princeton.edu/system/files/webform/13590028771.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c4.bin
da00a2ccadfeb1e282bb084447086830188dda35d4f31afcdadd48daf7a88003
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 5184 bytes
font_01_sfnt_off0000e855.bin
ad98690f98ecd6e2d952867aa37f7ff10ae04092b33a8d8f74948e54f9a228cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 9512 bytes