Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b46ddc6baa8f86…

MALICIOUS

PDF

40.7 KB Created: 2020-05-23 00:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3993973af5fbf4b77378d685f37a29ee SHA-1: 198bab59e8a7dc32b9e46ed30aa793a0bcf5e2a7 SHA-256: f3b46ddc6baa8f86accb1a3677b5787748bd2af38c2dfb0957097135981cf3fb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML_NYX_PDF_MALICIOUS heuristic also flagged this file with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://chrisbosgraaf.com/uploads/1/3/0/5/130551186/130551186.html#libmp3lame.dylib+file+download
    • http://dayakquest.com/uploads/1/3/0/6/130603836/f06ce0e6a0d.pdf
    • http://teddysintel.org/uploads/1/3/1/8/131856531/c8451170e114.pdf
    • http://rubyland.info/uploads/1/3/1/6/131606955/4967853.pdf
    • http://crjcompany.com/uploads/1/3/0/8/130813325/sumalaf.pdf
    • http://awecafcom.net/uploads/1/3/1/3/131398461/juboxim_zoxutojijegatu.pdf
    • http://arie-de-wendt.com/uploads/1/3/0/9/130970016/gulimimun-panituviwek-vetomuvegewuvol-fezunisobi.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_off00005dc6.bin
4fada7f731b0d86ad40c6c5132e51e58f1285bc61009ee2c9922a7cf6966cd76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC6 1920 bytes
font_01_sfnt_off0000665c.bin
6def1df3f2854c4ede2f72272c283f15b218391e994dac02ecd96152dfe1b35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 20612 bytes

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