Malicious PDF — malware analysis report

Static analysis result for SHA-256 727ac4d73cd67014…

MALICIOUS

PDF

34.7 KB Created: 2020-06-15 23:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bdc8c30019139deea9e8ea581eddc9a SHA-1: b19a2bfa10822cac9aa14ee1b55e569521ab259c SHA-256: 727ac4d73cd670144e953b8ebba60afa34ce75a263db7444a03b5500a3737ee3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the presence of a link farm and embedded URLs. No scripts were extracted, but the structure and numerous external links suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pamelalipkinmd.com/uploads/1/3/1/8/131871698/131871698.html#fun+multiplication+worksheets+grade+2
    • http://angelsathomeclean.com/uploads/1/3/0/7/130775643/bb329752f01bf23.pdf
    • http://the-bankruptcy.com/uploads/1/3/0/5/130551343/3765664.pdf
    • http://wcd-hxoii64p.mgh-r.ch/uploads/1/3/0/6/130605516/a52a8cc56a72b.pdf
    • http://beyondshirts.shop/uploads/1/3/0/7/130776485/bateg_palazuraw_xupemapadute_pegibavuwoponet.pdf
    • http://ablackeyedsusan.com/uploads/1/3/0/9/130969656/mutifexivefa-pavok-xidakamol-rimizutukibib.pdf
    • http://triplejumphomes.org/uploads/1/3/1/3/131379217/nireb.pdf
    • http://theaddcouple.com/uploads/1/3/1/4/131453871/sezox.pdf
    • http://baumannengineering.ca/uploads/1/3/1/4/131436978/pifomijimu.pdf
    • http://mail.healingscarredhearts.com/uploads/1/3/0/6/130639659/3403557.pdf
    • http://memsart-gallery.com/uploads/1/3/0/2/130288439/sebuselado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00004a9e.bin
9d799d70ff20fe12e973355e02f25c743e55202f03caa0ee1397bb06eee307f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9E 9180 bytes
font_01_sfnt_off00006a2d.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2D 16204 bytes

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