Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10956a7c788c3b3…

MALICIOUS

PDF

43.9 KB Created: 2020-05-24 02:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02f1ac835e774be52fb82282eb16d02c SHA-1: 0ad9124f5484e219f2f21c02448e7c578b8c7219 SHA-256: d10956a7c788c3b38ead6aadb7a1047d64d9e4d68a68e83de90d1b5dd4f59d01
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files on various domains. This pattern is indicative of SEO poisoning or a link farm used to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://usgss.us/uploads/1/3/0/6/130620430/130620430.html#cas+pratique+droit+social
    • http://mrsseamonsclass.com/uploads/1/3/1/1/131164318/1429130.pdf
    • http://shopdsu.com/uploads/1/3/1/4/131438309/6121900.pdf
    • http://snoshavery.com/uploads/1/3/0/2/130289171/9905337.pdf
    • http://bugess.suprcycle.com/uploads/1/3/0/5/130590195/6328518.pdf
    • http://jemonykricketz.biz/uploads/1/3/0/5/130589202/ruluderadorukepur.pdf
    • http://shuttlemonkeyrides.com/uploads/1/3/0/7/130739450/wigizuxo.pdf
    • http://dis-propertyimages.com/uploads/1/3/0/3/130312964/7489687.pdf
    • http://celebrationperformers.com/uploads/1/3/0/3/130313433/davepevejominig.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_off000074e2.bin
ac563f1180543c9f4d9b102108afa0e0941b2fd4f199aa08af3cddd05ca1801a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E2 2048 bytes
font_01_sfnt_off00007dbd.bin
992d764c4a5d723c7ed3e28ed2b90fc3edb09469e197eaf6deb2ab755b493114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 12088 bytes

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