Malicious PDF — malware analysis report

Static analysis result for SHA-256 744b6766ed4c1839…

MALICIOUS

PDF

43.4 KB Authoring application: Inkscape
MD5: e5ebc470850466f14b0c45ea4de80693 SHA-1: 2a946a3ba82619087f6599d206faba7cb2227271 SHA-256: 744b6766ed4c1839b50c9ec808b8221c92d256f33d2cb318bcf4e167329a4f91
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external PDF files hosted on various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing or traffic redirection. While no scripts were directly extracted, the structure suggests a link farm designed to distribute traffic or content, potentially leading to further malicious activities.

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://thelavendermermaid.com/uploads/1/3/0/4/130436307/afe41dcfc907e73.pdf
    • http://bgmlondon.com/uploads/1/3/0/3/130313057/kutenojidamaw.pdf
    • http://netballinthecommunity.co.uk/uploads/1/3/0/5/130590435/wivumeneza.pdf
    • http://arizonashelfcorporations.com/uploads/1/3/0/6/130604126/7064367.pdf
    • http://nuobeijing.devsite-1.com/uploads/1/3/0/5/130589057/130589057.html#what+is+a+critical+control+point+mean
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000101d.bin
6ecb8c3714b1e2f636c8c6426e3fa9c5bdf72b196b51d1ccc3949b136729c23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D 7932 bytes
font_01_sfnt_off0000638c.bin
d459ff9d9192a86415cf32b375e7121a13d7d35788aedfb3a2b50e9975528c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 16108 bytes

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