Malicious PDF — malware analysis report

Static analysis result for SHA-256 f751b5040c99c005…

MALICIOUS

PDF

45.3 KB Created: 2020-06-18 09:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d26910c27b4cc2d325d661ff6f2297f SHA-1: 6ce9df957f7808302aad9fa1cf3dd6b98919add4 SHA-256: f751b5040c99c005d859150c016d40e06d850799445fb8afcda6bd5e95da2ed8
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm or SEO spam operation. The primary URL, http://cvkhotel2.turkish.devsite-1.com/uploads/1/3/1/4/131407882/131407882.html#php+mysql+cms+tutorial, suggests a lure related to web development tutorials. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cvkhotel2.turkish.devsite-1.com/uploads/1/3/1/4/131407882/131407882.html#php+mysql+cms+tutorial
    • http://malmesburymarlins.com/uploads/1/3/0/7/130739802/d0f4ff0124d.pdf
    • http://angelabusiness.com/uploads/1/3/1/8/131856890/malagijatepuso-ramibamepuvepuf-jezesaxipasaler-karegarajin.pdf
    • http://moskamusic.com/uploads/1/3/0/3/130323612/7f465cf4.pdf
    • http://bigtel-entertainment.com/uploads/1/3/0/8/130814858/4857024.pdf
    • http://mta.safehavenworship.com/uploads/1/3/0/7/130740492/kuxavanu-kijunezavo-zifab.pdf
    • http://mhs99.com/uploads/1/3/0/4/130483393/6394395.pdf
    • http://boystowntheseries.net/uploads/1/3/1/8/131872017/kaxomu.pdf
    • http://danielbi.shop/uploads/1/3/0/6/130605258/9913469.pdf
    • http://thomasfam.ca/uploads/1/3/0/9/130969910/vumujige.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007271.bin
c724bd62e0de2202f4080a930e0c06305d42afa9486a533bf616a570eb64b1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7271 5060 bytes
font_01_sfnt_off000083a5.bin
adf22a3e2168c477a8edb04efce5a1c863b0ceb9a5d36dc1331d625472419b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A5 11032 bytes

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