Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3dd414e04873dc…

MALICIOUS

PDF

37.0 KB Created: 2020-04-08 07:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 99db2a2f77ce502c4f5f70f67df16099 SHA-1: 5f71bccb7d8b2e7f2c70baf97c48f814a74f3a6e SHA-256: fe3dd414e04873dcb414444880ffd504c046e261ebd8ea04c1937fe3ae9a19d9
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though partially corrupted, contains references to URLs that are also present in the heuristics, suggesting a deliberate attempt to redirect users. The primary attack pattern observed is the use of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://johnsonandsonsservices.com/uploads/1/3/1/3/131384098/131384098.html#similarities+between+montessori+and+reggio+emilia+pdf
    • http://improveyourvoice.training/uploads/1/3/0/6/130603946/dovafimofuz.pdf
    • http://tstraw.com/uploads/1/3/0/3/130379407/a99d7d5da6.pdf
    • http://artbyltj.com/uploads/1/3/0/2/130288924/4c4613d70b45.pdf
    • http://omnapr.com/uploads/1/3/0/6/130604878/ced96597944.pdf
    • http://explorethewilderness.net/uploads/1/3/0/7/130776578/290830a35a1.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_off00006a5d.bin
bdf665a1e4f09af2103b4ed41d802e077f89089105781a6c3fcba306d70b5e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5D 7728 bytes

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