Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d152698185c840e…

MALICIOUS

PDF

27.6 KB Created: 2020-04-11 09:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b27c9f042d0dfaabd4b9860874fecc2b SHA-1: d508412e1e4aba43b7a99bba225c6cd064acbaa3 SHA-256: 8d152698185c840e6b46559d134eee45abbdc14571497d1bcb86a37e06e64011
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to a Dell datasheet, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://74-123-77-252.mgwnet.com/uploads/1/3/1/3/131378988/131378988.html#dell+r840+datasheet+pdf
    • http://phoenixfutbol.com/uploads/1/3/0/6/130603825/mokegotax.pdf
    • http://heritagereports.com/uploads/1/3/0/6/130604415/jenididijojikataror.pdf
    • http://sabyhage.se/uploads/1/3/0/4/130435960/rufakurapasusev_xozidawuli_fiwikubofo_kamav.pdf
    • http://brainfreezefilms.com/uploads/1/3/0/7/130775221/mijevuwonewo.pdf
    • http://keepitreal-kevin.com/uploads/1/3/1/3/131383383/41800.pdf
    • http://ecofaireintl.com/uploads/1/3/1/0/131069987/bafor.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043f8.bin
109e9e51355cde6c0ee22193469dae72b36bc2f753f3d6e0bf8c0a2133dd044d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43F8 8192 bytes

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