Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3fefae5d4b1e7…

MALICIOUS

PDF

63.0 KB Created: 2020-04-14 22:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b42df9de62920a63e56b475c343d7a2e SHA-1: 71ac858a0d0d74a80c187ee4acf5cd7110a7bfde SHA-256: 3aa3fefae5d4b1e7b466b20d1adc3212c6cc57cb1a7b9d105554254651e564c0
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains a title related to a guidebook and references to the wkhtmltopdf tool, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown reputation URLs supports a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://slccdburnham.com/uploads/1/3/1/4/131406253/131406253.html#bancroft+and+district+regional+mineral+collecting+guidebook
    • http://westerngraphics.us/uploads/1/3/0/8/130873902/sutukobefotemim-komejat-joruxarubixelo.pdf
    • http://contonix.com/uploads/1/3/0/8/130874539/pirenazope-regejina-tukebof-buzanad.pdf
    • http://summasportswear.com/uploads/1/3/1/4/131408928/f81f94f9f33c9a4.pdf
    • http://irstranscript.com/uploads/1/3/0/6/130621305/a70f43061dbf18.pdf
    • http://meridiancorporatecenter.com/uploads/1/3/1/3/131398380/gajonanurizas.pdf
    • http://levensondesign.com/uploads/1/3/0/9/130969709/b5c0e6be655c.pdf
    • http://mapcaptraining.com/uploads/1/3/0/2/130288383/zamiloras_bobotinatoza_jevasupavagutat.pdf
    • http://timeforpositive.com/uploads/1/3/0/6/130621210/4586a350.pdf
    • http://firehausfarms.com/uploads/1/3/0/9/130969172/2749661.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_off0000cd3e.bin
f902ea89249eb0a76c7cd22f78d847dff6e4ae1d319c7721a75e1a6b8bba8bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 9028 bytes

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