Malicious PDF — malware analysis report

Static analysis result for SHA-256 25faa54b28238e8c…

MALICIOUS

PDF

45.5 KB Created: 2020-04-15 18:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bc98854fe950f08393ea29dc6c6597a3 SHA-1: 3bc9d11f7913ae6847352c3f77694cd561ff383d SHA-256: 25faa54b28238e8ca517a5c2c75aa6a5bb1c0ea64e9ecefaa1ae526f65970dc9
92 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs designed to direct users to potentially malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of linked PDFs, and the PDF_URI heuristic specifically points to a URL related to 'kuccps admission letters kenyatta university'. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file. No scripts were extracted, but the extensive use of external links suggests a phishing or redirection attempt.

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://truebestself.com/uploads/1/3/0/6/130620672/130620672.html#kuccps+admission+letters++kenyatta+university
    • http://worldofentopia.com/uploads/1/3/0/8/130813898/zedowazizirowituji.pdf
    • http://averyschaefer.com/uploads/1/3/1/4/131455825/8579366.pdf
    • http://remaxpros.info/uploads/1/3/1/3/131383383/turid.pdf
    • http://creatingthecircle.com/uploads/1/3/0/6/130603932/sanetapigago.pdf
    • http://daughterskitchen.com/uploads/1/3/0/6/130639621/levewapirorovu_wegaxotabono_geretibepikod.pdf
    • http://whittingtonpd.com/uploads/1/3/0/5/130551264/af0ea3e79.pdf
    • http://crosshillcomputing.com/uploads/1/3/0/5/130547689/771d6.pdf
    • http://slashmyexpenses.com/uploads/1/3/0/9/130969308/guxoborejanet_kumawur_savewoja.pdf
    • http://dennisandanni.com/uploads/1/3/0/3/130312916/539992.pdf
    • http://dsrgolftournament.com/uploads/1/3/0/5/130589098/6081942.pdf
    • http://abcpreschoolcville.com/uploads/1/3/0/4/130489448/kikijagasekapej.pdf
    • http://gracexcosmo.com/uploads/1/3/1/4/131413951/18b2f050a.pdf
    • http://greenlandlandscapemasonry.net/uploads/1/3/0/7/130739470/lobogegobe.pdf
    • http://crosshillcomputing.com/uploads/1/3/0/5/130547689/771d6
    • 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_off00008889.bin
a1c024e65c9dce98c1057c835eefb42fddf4abb21726512e9327073aa09f10ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8889 8520 bytes

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