Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f3613a06c43317…

MALICIOUS

PDF

36.2 KB Created: 2020-06-25 09:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ddc54d28865c2ea1e5b25ecc26dce62 SHA-1: 407ee3370085f1aee14e778a6974b34a8e82dc6f SHA-256: d4f3613a06c4331786011b0ed0324358283734c7b0692d61135faa8dacf87951
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on domains associated with link farms and SEO spam. The document body, though partially corrupted, suggests a lure related to 'Grade 8 english comprehension exercises'. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

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.
  • 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://ashapili.com/uploads/1/3/2/3/132302907/132302907.html#grade+8+english+comprehension+exercises
    • http://colcas.xyz/uploads/1/3/0/7/130740562/ec06f1af530e.pdf
    • http://my-taza.com/uploads/1/3/0/3/130379821/fimed.pdf
    • http://16j.undesirable.us/uploads/1/3/1/3/131398575/madiri-gudixenut-kopazeta.pdf
    • http://cincydraft.com/uploads/1/3/0/6/130604074/duxowadufopeza_miriga_vawizurofu_godojano.pdf
    • http://customcolormcr.com/uploads/1/3/0/4/130435892/90aec.pdf
    • http://webmail.banana-asia.com/uploads/1/3/1/4/131406784/fuxojetiniv_zabexexise.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_off00005047.bin
d2d2a6e163d453dc0b8faeaa4c739fdc96a99e305a0190ec6df7fe73540f0680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5047 5488 bytes
font_01_sfnt_off000062b4.bin
fb940c133077b21b35757775fafdf364107cfbd018263eaf62b42831a5eced54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B4 9912 bytes

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