Malicious PDF — malware analysis report

Static analysis result for SHA-256 c798fbbba306910d…

MALICIOUS

PDF

42.5 KB Authoring application: Nitro PDF
MD5: 9b1bfcef3023f6a3aea4fb18152b9ee2 SHA-1: 99f76909cb743f6e76288534308a5a0bb0829b31 SHA-256: c798fbbba306910df9c54acdd97e7c671df9adc43c9ed824aec556a7698fb0c8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files hosted on various domains, indicative of a link farm. This technique is often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with the PDF_SEO_LINK_FARM heuristic.

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://brightbuzz.biz/uploads/1/3/0/6/130620234/8022617.pdf
    • http://nationalbeachranking.com/uploads/1/3/0/2/130271080/9768014.pdf
    • http://rqacommittees.com/uploads/1/3/0/6/130620797/8853933.pdf
    • http://armydarkshadows.net/uploads/1/3/0/5/130550901/fudatalo-fijaniluwaxa.pdf
    • http://angelavinson.com/uploads/1/3/0/6/130605490/56e03c5db4c97.pdf
    • http://study-spanish-educator.com/uploads/1/3/0/2/130272979/zenigazozotu.pdf
    • http://neoericksonian.net/uploads/1/3/0/6/130605380/dikurirurusaj-bikonugijuk-nibodivit.pdf
    • http://moldinspectalbany.com/uploads/1/3/0/6/130604606/4660092.pdf
    • http://arcadesalvacioncarpinteria.com/uploads/1/3/0/2/130289711/gariwoton-nozekuzu-vuxixonefonan.pdf
    • http://citylabatelier.com/uploads/1/3/0/2/130271229/1982532.pdf
    • http://btimsp.com/uploads/1/3/0/6/130620946/130620946.html#continuing+professional+development+certificate+template

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012ca.bin
48deb927f691615953508dfabe5db9089abd3d8fa28f737cbfaae9d45e390075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA 8792 bytes

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