Malicious PDF — malware analysis report

Static analysis result for SHA-256 7650fcf200fc1225…

MALICIOUS

PDF

54.7 KB Created: 2020-06-01 00:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 838491e402572be3341997803bec2c1c SHA-1: fb92dc24c73bbd12c349ee1ceaea4fdfe71b4f5d SHA-256: 7650fcf200fc12259f7cdbc38102b403dbd2b9947dc0c250c078f733e6da5b93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on WordPress.com, suggesting a link farm or SEO manipulation tactic. One prominent URL, http://legallitigationsolutions.com/uploads/1/3/0/5/130590432/130590432.html, is flagged as suspicious and likely serves as a lure to a malicious resource. The ML classifier strongly indicates maliciousness, and the PDF structure itself exhibits suspicious characteristics.

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://legallitigationsolutions.com/uploads/1/3/0/5/130590432/130590432.html#read+delicious+in+dungeon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sobupex.files.wordpress.com/2020/06/juzisuxu.pdf
    • https://danadarebu.files.wordpress.com/2020/06/gunerinuvu.pdf
    • https://bifipararavo.files.wordpress.com/2020/05/57234573996.pdf
    • https://pasetigezilu.files.wordpress.com/2020/05/zusezawoguwitidexizeb.pdf
    • https://sakeweter812408916.files.wordpress.com/2020/06/bedev.pdf
    • https://jadipevuju.files.wordpress.com/2020/05/pigegitemebalog.pdf
    • https://rupaneluron.files.wordpress.com/2020/05/30461645635.pdf
    • https://sixuxonudibi.files.wordpress.com/2020/05/sororazedixudufetujerar.pdf
    • https://tigeburilote.files.wordpress.com/2020/05/wafujufalepa.pdf
    • https://kopeboxapum.files.wordpress.com/2020/05/16448287733.pdf
    • https://dipajar.files.wordpress.com/2020/05/renujuxaloza.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007088.bin
cfe2c23917f9aa6c91885e417903826dbdbf0d1b982d00f691bf05fec07f0fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7088 17100 bytes
font_01_sfnt_off0000a7e9.bin
2aebab14a8be489c83dfd0044d561fea4e46d0e588958f93cb72947d770e95de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E9 11824 bytes

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