Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f52b3bba6668be…

MALICIOUS

PDF

51.1 KB Created: 2020-04-10 10:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bf886d527c846414f6001f9d32f3e73f SHA-1: deb2d145ca10b8456ca9aa6d280733ad072b591a SHA-256: b1f52b3bba6668bec9da0b45418d0824e67c0d797b79ae8676e6643ad0af8d35
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links pointing to various domains, a technique often used for SEO link farming or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body contains garbled text but also includes URLs that are part of this link farm, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zellawatson.com/uploads/1/3/0/6/130620789/130620789.html#como+pasar+de+grados+f+a+c+formula
    • http://tndtemp.net/uploads/1/3/1/6/131637668/loxudenixenona_fiwajesekidav_zuvemaxalod_bodemunedota.pdf
    • http://clickpayuniversity.com/uploads/1/3/0/7/130775835/dotiziruteximo.pdf
    • http://vintiquechix.com/uploads/1/3/0/2/130291561/8b3e27b070a.pdf
    • http://headrushvape.com/uploads/1/3/0/8/130814017/16d91fe.pdf
    • http://tracinilsson.com/uploads/1/3/0/4/130488583/de81c.pdf
    • http://h2see.net/uploads/1/3/1/3/131398400/1805377.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008447.bin
acd2f20d1f017f24d3d5257c4cd44141d7f57a39af761cbe39175ec8c9996553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8447 9492 bytes
font_01_sfnt_off0000a668.bin
393eebd439fde80c6623649a4e8578541a0f1ebfe4a63d8f26af557d832932c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA668 16720 bytes

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