Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97dfad2f19aa09b…

MALICIOUS

PDF

46.0 KB Created: 2020-06-24 00:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3fd699c189c6d0496b528217e88012 SHA-1: ca639c8b08272fbbe93d8ee390e057c6c3fc96db SHA-256: a97dfad2f19aa09b38fb5380379029e48ab4c190cb51b780c52ddba62925c3b4
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files. This behavior is indicative of SEO poisoning or a link farm used to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body is largely unreadable binary data, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://livingwellmassagetherapy.net/uploads/1/3/0/7/130776641/130776641.html#computer+installation+and+maintenance+pdf
    • http://dieporzellanklinik.de/uploads/1/3/1/4/131406656/2756239.pdf
    • http://daphoopsbasketball.com/uploads/1/3/1/3/131398237/devozukanagu-tokis-lisarunibezal-bagamez.pdf
    • http://permianmobile.com/uploads/1/3/0/7/130775649/89a801053400.pdf
    • http://youthee.org/uploads/1/3/0/8/130874641/6f9316f175.pdf
    • http://mta-sts.bowmanvillechristianpreschool.com/uploads/1/3/0/7/130775929/1e533ed.pdf
    • http://theveggiedipmix.ca/uploads/1/3/1/4/131453099/zetiwazu_zebekom_gofejefebobuni_dalewona.pdf
    • http://webmail.banana-asia.com/uploads/1/3/1/4/131406784/fuxojetiniv_zabexexise.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.pdf
    • http://wrebs.com/uploads/1/3/0/5/130542922/8774498.pdf
    • http://glyphie.com/uploads/1/3/1/3/131384244/3073185.pdf
    • http://lovespellsfordesires.com/uploads/1/3/0/9/130969496/8cbafda8.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_off0000763e.bin
b6029ebe5d3a0d5e73473b45e7fb76f208d65f9392f0e14e6467bf5021501603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 5208 bytes
font_01_sfnt_off000087d3.bin
ad168d02794280ea301c7ab41b3e6ca1eb8008ce4da9e0c16de064767ed14a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D3 10464 bytes

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