Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b31b24b40d0288…

MALICIOUS

PDF

55.1 KB Authoring application: Smallpdf Desktop
MD5: 156de9ba9a285eefbb492415edd68718 SHA-1: 2ca5ffc57ecb0afbf446d47d3465f5004ae240f8 SHA-256: f4b31b24b40d0288caccd886edac71967ecfe818f51dc944bf21326eb94225ab
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further indicate malicious intent. The document body, though obfuscated, contains references to medical guidelines and embedded URLs, suggesting a lure to external malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://philanimalrescue.org/uploads/1/3/0/4/130489933/7468391.pdf
    • http://nfldraftdays.com/uploads/1/3/0/6/130604105/melos_kogew_zeluliluzi.pdf
    • http://njprint-wear.com/uploads/1/3/0/4/130477915/291e58ed641.pdf
    • http://mymancardgame.com/uploads/1/3/0/4/130478648/605097.pdf
    • http://message6666.com/uploads/1/3/0/5/130588989/eb0af34306bf31.pdf
    • http://misspaulasyoga.net/uploads/1/3/0/5/130550956/8620283.pdf
    • http://thehappygirlstore.com/uploads/1/3/0/7/130738548/130738548.html#hepatorenal+syndrome+new+guidelines

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115f.bin
743f029b149051c00769045b826aab9f0af15e167d0765559c1f71254b0fedf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F 9804 bytes
font_01_sfnt_off000090f0.bin
448c4d4550ed59c7e8e80b6d66b986666620351883d23913e38401b861762e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F0 16368 bytes

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