Malicious PDF — malware analysis report

Static analysis result for SHA-256 deef6bcdfc303ef4…

MALICIOUS

PDF

38.8 KB Created: 2020-04-07 19:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c1218c078e919a53886ad09239e91414 SHA-1: 7e04e39ddbc91963beb466ce712a361cecfed49c SHA-256: deef6bcdfc303ef44c72a9d712ba8b237d913aa28c2d6ddbcc6024cf66f98ba9
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to various domains, indicating a link farm or SEO spam operation. The document body mentions 'piano sheet music', suggesting a lure to attract users to these malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://135sbma.com/uploads/1/3/0/5/130590664/130590664.html#god+on+the+mountain+piano+sheet+musi
    • http://fitzenterprisesllc.com/uploads/1/3/0/6/130605089/zezodalepepidax-zadazudif-xoboponefuramo.pdf
    • http://buda.ee/uploads/1/3/0/6/130605212/de48379ebf9a4.pdf
    • http://fitbyflex.com/uploads/1/3/0/7/130738972/pakakosibasanofo.pdf
    • http://claystuffauthor.net/uploads/1/3/0/5/130590596/polodulesazal.pdf
    • http://mail.studiomodasport.it/uploads/1/3/1/1/131164358/a4a90bae99f.pdf
    • http://myproelec.fr/uploads/1/3/0/3/130323384/godutaforap_xowide.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_off00006c5c.bin
1162978aacca1ccc148efd8ec797a883e3a085122b53e67471df9165fe7ce096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 9236 bytes

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