Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69d34dca9872293…

MALICIOUS

PDF

64.3 KB Created: 2020-06-08 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03e62eb93deddd0a62663f93532d8013 SHA-1: dc412ee8d6fbe60d24a4943a21327cbb8efff9ee SHA-256: c69d34dca9872293102d4edebccad89b63b1dd65a695883b9dc94243fae68361
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to pharmaceutical companies and the wkhtmltopdf application, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs reinforces this assessment. The primary attack pattern involves redirecting users to malicious content via these links.

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://webdisk.jhigh18.com/uploads/1/3/0/5/130543240/130543240.html#compa%25C3%25B1%25C3%25ADas+farmac%25C3%25A9uticas+en+clayton+n
    • http://fileandfile.org/uploads/1/3/1/1/131163833/zimifu.pdf
    • http://venustiffanys.net/uploads/1/3/1/1/131164173/5643268.pdf
    • http://dongtaiyulechengkaiye.br3h.com/uploads/1/3/1/6/131637242/tideginakizurezibere.pdf
    • http://nofone.net/uploads/1/3/1/6/131606331/6759693.pdf
    • http://rattingonrodents.com/uploads/1/3/0/5/130546434/deguvofe.pdf
    • http://wibmexpo.com/uploads/1/3/0/7/130739235/5684566.pdf
    • http://bigpond.shop/uploads/1/3/0/8/130815093/378010.pdf
    • https://bijufexabez.files.wordpress.com/2020/06/18483200525.pdf
    • https://gokidomaj.files.wordpress.com/2020/06/81269186602.pdf
    • https://xelilen.files.wordpress.com/2020/06/vuginuje.pdf
    • https://jidinetobix.files.wordpress.com/2020/06/36837035120.pdf
    • https://fozebide.files.wordpress.com/2020/06/27619602724.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_off0000cbf2.bin
0dce1bc83f03488620630430cb050bc22bdb8858df2237ad59768e264577d84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 12336 bytes

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