Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91565a378131789…

MALICIOUS

PDF

35.2 KB Created: 2020-05-24 03:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e269e5744765c7128b0dd295ff9488c SHA-1: e04ce3ccd7b5018df5f3c04053211d5fdbee1e26 SHA-256: e91565a378131789d187ec9d3215d1cd79b8739e837e75cc06b71d6ed3006b70
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to a network of similarly structured PDF files hosted on various domains. This pattern is indicative of a link farm or traffic distribution system, often used to obscure the ultimate destination of malicious payloads or for ad fraud. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://1j2.undesirable.us/uploads/1/3/1/3/131383820/131383820.html#calculo+instalacion+de+gas+excel
    • http://hungrymondays.com.au/uploads/1/3/0/5/130540461/gogumuzejadumes.pdf
    • http://shpurshirefarm.com/uploads/1/3/0/6/130639373/desufibuxitejam.pdf
    • http://engfeat.club/uploads/1/3/0/5/130538997/vijalonazutujabolok.pdf
    • http://diyaladdinpatios.com/uploads/1/3/0/6/130620313/kirupak.pdf
    • http://corporacionongideal.com/uploads/1/3/0/7/130775644/ac4bff3245552.pdf
    • http://breakthroughbroadcasting.com/uploads/1/3/1/3/131384044/22e447706b3.pdf
    • http://eddieoates.com/uploads/1/3/1/3/131384567/4818110.pdf
    • http://agencepro-pose.com/uploads/1/3/1/3/131380973/wemuvefoxelifefu.pdf
    • http://mail5.street-sharp.com/uploads/1/3/0/7/130776458/3938857.pdf
    • http://mta-sts.mx.gabrielsherry.com/uploads/1/3/1/6/131606321/dilefuxalonuxito.pdf
    • http://randspaintinganddecorating.com/uploads/1/3/0/8/130813696/24d59bd4e761.pdf
    • http://mathoutreach.com/uploads/1/3/0/3/130313115/vuxaf.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_off00005d06.bin
cd4cb4fe584280241cd43caca27bdb2cb68df23157dd2e452cd3e05730336446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D06 10724 bytes

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