Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad02d6b7f72b788…

MALICIOUS

PDF

65.4 KB Created: 2021-04-07 08:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8520147961c41b05feaaa295fd710188 SHA-1: bc791efd9f5b2c9b369120e3ef12bb7dc5342ac1 SHA-256: 5ad02d6b7f72b78879d4099558757a3466bfe9fe82f7fcc01c6592fab1c9a422
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the file is a link farm hosted on disposable domains, suggesting a phishing or spamming campaign. The embedded URLs, while some are confirmed benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8928

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/87400145234.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/93477879009.pdf
    • https://ambrose.edu/sites/default/files/webform/vopezupudatirarib.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/ziwisotug.pdf
    • https://ambrose.edu/sites/default/files/webform/58234525485.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/lomaxitafuvutatu.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/80411930416.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/fukixuliwidopisoduzurapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=good+news+bible+online+free+download+pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/56905881998.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65c.bin
9cbec52ecf8e03acaad62248f2eb3521cb95c462116671f0a377f04606077bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 5296 bytes

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