Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0fd85b4ca7913a…

MALICIOUS

PDF

34.2 KB Created: 2020-03-08 06:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c302267723268874927a587d27d75264 SHA-1: 72f480870e30e1a17d6e561ebe23f31cd6599f85 SHA-256: 9b0fd85b4ca7913a8e2edd0634326930667c70fd0066e160df499a14fdd040ec
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 various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body content is largely unreadable, making it difficult to determine the exact nature of the payload beyond the link farm. The primary IOCs are the numerous external URLs embedded 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://adsl-63-204-18-53.benefitplans.org/uploads/1/3/0/9/130969838/130969838.html#algebra+1+graphing+exponential+functions
    • http://www.transformationsbirth.com/uploads/1/3/0/7/130738637/witudukedugano.pdf
    • http://morganstermiteandpest.com/uploads/1/3/0/5/130590142/f81aa90.pdf
    • http://mail.espartana.com.pt/uploads/1/3/0/5/130539888/wufewurudiga-vofulagaleronat.pdf
    • http://jaspermarianek.org/uploads/1/3/0/7/130775085/dupenebutujufoz.pdf
    • http://allisonyelton.com/uploads/1/3/0/5/130589411/xezetararodapuv.pdf
    • http://mx.afftonparentsclub.org/uploads/1/3/0/3/130323612/312991.pdf
    • http://newmillerdam.org/uploads/1/3/0/7/130740097/rafudomoxuvule.pdf
    • http://www.zaeligracefoundation.com/uploads/1/3/0/6/130604561/6709984.pdf
    • http://dan-lynch.com/uploads/1/3/0/5/130588858/nemuzotemo.pdf
    • http://megananspach.com/uploads/1/3/0/5/130590716/muwunisuwotena.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_off00005d57.bin
70601fcfbce2e0312754b1bae1c4f219791775cdf4e70a36e287de76febd7d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D57 7760 bytes

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