Malicious PDF — malware analysis report

Static analysis result for SHA-256 939cd0f2827f871f…

MALICIOUS

PDF

43.2 KB Created: 2020-04-06 13:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f4a43184bf006d3ad3c4aff964852d8 SHA-1: e4b580da312c96319dc5db86fafdbcef5df8f960 SHA-256: 939cd0f2827f871f87806c4dd054b6d66738fa18f5bc19e207fb089807216252
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive link farm suggests a delivery or redirection mechanism. The primary IOCs are the numerous URLs found within the document.

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://thegreenedgebookkeeping.org/uploads/1/3/0/8/130814062/130814062.html#como+funciona+la+cadena+trofica+en+el+manglar
    • http://kristalkracht.nl/uploads/1/3/0/2/130273581/dapud.pdf
    • http://disastersupply.org/uploads/1/3/1/4/131407469/likuzukobano-nititufe.pdf
    • http://wzb-ludwig.com/uploads/1/3/0/6/130639933/7672359.pdf
    • http://smart4edu.org/uploads/1/3/0/6/130621472/nusunoforigalopek.pdf
    • http://riverstonepsychologicalservices.com/uploads/1/3/0/8/130874681/rumanewikebifo.pdf
    • http://renovationparis.fr/uploads/1/3/0/2/130270834/6817380.pdf
    • http://shallowaterlittleleague.org/uploads/1/3/1/4/131453259/8a75f6ffea.pdf
    • http://clearpathwaysllc.com/uploads/1/3/0/9/130969390/viwizi-besem-vibizizedirup-xelefizene.pdf
    • http://aghomes.org/uploads/1/3/0/7/130775118/nasefo-topasilatawez-fonadivibi-nozarukaseje.pdf
    • http://candyhire.com/uploads/1/3/0/7/130775251/todopazasododivake.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_off00007d66.bin
2a7f8a9c2c72bc90021c700109dccaab01d76ef5ea9bb69bec4d288aa8f9b404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 8932 bytes

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