Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5c2e81e872650c…

MALICIOUS

PDF

40.8 KB Created: 2020-04-01 15:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b9ccb2ac7a07e00c93d8a87487064ee SHA-1: 041ca1906d98b7af050371a9d54c3852b17f7290 SHA-256: 5a5c2e81e872650c2355a389a7ba662672f796786046a8a9b0cf8a25d5e7c220
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or distribute malicious content. The embedded URLs point to various domains, many of which appear to be part of a link farm, and one specific URL is http://biggerstick.net/uploads/1/3/1/0/131069859/131069859.html#tupperware+stack+cooker+easy+recipes. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://biggerstick.net/uploads/1/3/1/0/131069859/131069859.html#tupperware+stack+cooker+easy+recipes
    • http://killerromance.com/uploads/1/3/0/2/130287845/buwomepatabaj_vuziripu.pdf
    • http://moonshot.games/uploads/1/3/0/6/130603956/wadovel.pdf
    • http://pisgahprovisions.com/uploads/1/3/1/4/131408838/xugixafis-lozudiza.pdf
    • http://painawayallnatural.com/uploads/1/3/0/5/130545985/6553234.pdf
    • http://drhiltonkaplan.com/uploads/1/3/0/2/130289719/9510889.pdf
    • http://mgg-management.net/uploads/1/3/0/5/130546538/f7234c213e671c6.pdf
    • http://capacitacionescomerciales.net/uploads/1/3/0/2/130272394/fe3dbc4736a3.pdf
    • http://gallerygeckos.com/uploads/1/3/0/3/130323298/4536113.pdf
    • http://www.felonybbqonline.com/uploads/1/3/0/9/130969281/d8553d64edad0.pdf
    • http://lakekathleenmachine.com/uploads/1/3/0/7/130776015/nurete-wujekuxon.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb5.bin
5a512f884d8f185ccedec8f3a6b1d76b541b6900e6b1df07d36f39f4e39eaf93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB5 9216 bytes
font_01_sfnt_off00008145.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8145 16036 bytes

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