Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cdeb5da395ecfa…

MALICIOUS

PDF

44.2 KB Authoring application: pstoedit
MD5: d39f8aac2f8bfbf1db24a03eb04308bc SHA-1: c5e376a34c5cf5e60d6c2d77610a151accaee20e SHA-256: 71cdeb5da395ecfaa5f244c14297dd51f65f30142c937a249067c48fa6f318a3
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, masquerading as an IELTS preparation document. This technique is commonly used to distribute further malicious content or to engage in SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://007securitynetworking.com/uploads/1/3/0/4/130483836/b1ae19c4a8f1.pdf
    • http://psychotherapyportland.net/uploads/1/3/0/6/130603841/padawokojira-fotutinolusid.pdf
    • http://advancedsteeldetailingltd.com/uploads/1/3/0/4/130489386/335771.pdf
    • http://alvarezorganics.com/uploads/1/3/0/5/130551675/sabizelomeg.pdf
    • http://viceroyautotrans.com/uploads/1/3/0/6/130639036/woziru-rimunokefod.pdf
    • http://ninedeg.kvoma.ru/uploads/2020/01/29/5797723.pdf
    • http://katrinadasilvaart.com/uploads/1/3/0/4/130476040/6026606.pdf
    • http://context-imaging.com.au/uploads/1/3/0/7/130738739/betasefas.pdf
    • http://nobuhotelriyadh-fullsite.devsite-1.com/uploads/1/3/0/6/130604919/130604919.html#map+ielts+task+1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011b5.bin
1848c6ffaab96465c128d07f9773ce11fb7c30a2b0d4c04fc8cf1cf63bc2cc6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5 8160 bytes
font_01_sfnt_off000071f0.bin
27aad4e7100ae85831cc1a9cf4859e84521ff6b1ee9ac199fa10e6c4d4b25dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F0 2736 bytes

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