Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ea04a456b77fa1…

MALICIOUS

PDF

47.6 KB Authoring application: Pdftk
MD5: c21abc717ba348c14cf98b67cd2cd6c0 SHA-1: 87c82b6d9baf50c75926566ab3902af2e0c8a4d7 SHA-256: f6ea04a456b77fa1fd81ac1eddea62f6231ac806d1e06f2f8fd98201022c6815
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, a technique commonly used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern involves leveraging these links to distribute further malicious content or phishing pages.

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://zatut.event-nsk.com/uploads/2020/01/28/dolilu_difeluj_goxasezupibaro_kekegukefi.pdf
    • http://nefex.vipiski-besplatno2.icu/uploads/2020/01/28/99921fc065.pdf
    • http://drbrewer.net/uploads/1/3/0/4/130476423/kezegumasotud.pdf
    • http://ourweefarm.com/uploads/1/3/0/6/130620951/6063805.pdf
    • http://unblocked-g4mes.weebly.com/uploads/1/3/0/6/130604806/3a0d4ecdac32.pdf
    • http://myeasystudy.com/uploads/1/3/0/6/130620674/694a2497f53.pdf
    • http://riapromotions.weebly.com/uploads/1/3/0/6/130639227/wesujakil.pdf
    • http://desiga.samo.su/uploads/2020/01/28/149ffdd8c.pdf
    • http://oaxhealth.com/uploads/1/3/0/5/130588378/kuropovus.pdf
    • http://kad.russtin.com/uploads/2020/01/28/743008.pdf
    • http://domesticabuseministry.org/uploads/1/3/0/3/130323430/vubinarometil.pdf
    • http://rehphotography.org/uploads/1/3/0/5/130540619/130540619.html#ejercicios+de+las+vocales+para+colorear

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012ba.bin
bbb5928d4cd6e486c4d5cf4abf27461cd1813fe3113bcccd0623b0e1c81bc8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA 8604 bytes
font_01_sfnt_off00007381.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7381 16204 bytes

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