Malicious PDF — malware analysis report

Static analysis result for SHA-256 de620a25629e7b36…

MALICIOUS

PDF

29.5 KB Authoring application: OpenOffice.org
MD5: 2420fb8a86012df59170ed9a69a8282b SHA-1: 934f76d1fcf4b5f2bef60519812b88397d4413b2 SHA-256: de620a25629e7b367f01fa27473b68de47a3c343481d782ce037343f96abc3a3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also strongly suggest maliciousness. The primary attack pattern appears to be a link farm, directing users to multiple other PDF documents hosted on various domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nvintl.com/uploads/1/3/0/6/130639397/c574148a6518.pdf
    • http://eagleeducationalservices.org/uploads/1/3/0/7/130739561/putakesulufine.pdf
    • http://northwesternbreastsurgeons.com/uploads/1/3/0/5/130551692/8225021.pdf
    • http://cornwall2theandes.com/uploads/1/3/0/5/130547418/0b21e12f.pdf
    • http://thereluctanttransformationalist.com/uploads/1/3/0/6/130640006/vimixivosuxa.pdf
    • http://truvisioncolombia.com/uploads/1/3/0/5/130589223/2926425.pdf
    • http://arcadiagardensllclandscapinganddesign.com/uploads/1/3/0/6/130604594/130604594.html#java+string+format+double+without+decimal

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001111.bin
5f10f692600bb770362bd91bfb7c9add74b20261decccba6c109ec35e0826039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111 8300 bytes

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