Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb17f90fa23902f…

MALICIOUS

PDF

42.4 KB Authoring application: pdf-parser
MD5: 2d9f0ef11c01f358085593d438b1abea SHA-1: 8a813b4a86cdc430424be77edbe2ace8f399ba94 SHA-256: dfb17f90fa23902f25114ce4bdf5aab855a40fa7db9e113967318109d43f8e21
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to download further malicious payloads or redirect users to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Dropper.Agent-7885695-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7885695-0
  • 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://mipelot.ntihomirova.com/uploads/2020/01/29/4d5ee15.pdf
    • http://smartlets.org/uploads/1/3/0/6/130604133/e310a4.pdf
    • http://pascorealestateblog.net/uploads/1/3/0/6/130621502/7138447.pdf
    • http://theelfbox.com/uploads/1/3/0/3/130323295/130323295.html#tell+me+about+yourself+sample+answer+for+fresh+graduate+finance

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001023.bin
e3865367d423f732a3622717da997787e038cf6892b4101468304621e031ee44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023 8588 bytes

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