Malicious PDF — malware analysis report

Static analysis result for SHA-256 978f66d59f585ea1…

MALICIOUS

PDF

36.7 KB Authoring application: LibreOffice
MD5: fb8e4bef73e87b56e782d5b6de837d19 SHA-1: 0fc96b42a2fab9e3f4bd0b37eeb8300751599ae3 SHA-256: 978f66d59f585ea1289f171fad1c43e0efc472cf6d271d19f697597c4f35053e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The document body, though partially corrupted, contains text related to 'Examen matematicas 5 primaria santillana' and mentions PDI resources, likely a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nathanraywilkerson.com/uploads/1/3/0/6/130604002/4268788.pdf
    • http://danwalkerwoodworks.com/uploads/1/3/0/4/130476859/0db0924f3.pdf
    • http://middlesouthplatte.org/uploads/1/3/0/3/130323092/2709014.pdf
    • http://kelseyleonofficial.com/uploads/1/3/0/3/130323478/519e7dbd73.pdf
    • http://olympicstrackandfield.com/uploads/1/3/0/5/130551324/6899115.pdf
    • http://ace1m.com/uploads/1/3/0/4/130476208/eaf1928bc49de2.pdf
    • http://mobileopsdetailing.com/uploads/1/3/0/5/130551143/migovebozo.pdf
    • http://thesingbabysingshow.com/uploads/1/3/0/6/130604983/130604983.html#examen+matematicas+5+primaria+santillana

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001188.bin
d61f782d8f369e8765d68e597b6e527d0e2f179c05b39102bf5b050c6c74a779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188 9592 bytes

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