Malicious PDF — malware analysis report

Static analysis result for SHA-256 8079e96e16e65382…

MALICIOUS

PDF

106.1 KB Created: 2020-06-02 00:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8ee58e8c64b8531d3df41b8854abac SHA-1: 7b6b3051429471c20c627b222d3ad504ad4b99ab SHA-256: 8079e96e16e653821c54907fecb8cdd5d2e2447387fad6ae253c426ec5497c0c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs with numeric slugs, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous unknown URLs suggests a potential for hosting malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://floreslima.net/uploads/1/3/1/8/131856907/131856907.html#analisis+fisicoquimicos+de+la+leche+condensada
    • http://waggingtailsnwetnoses.net/uploads/1/3/0/7/130776500/1580286.pdf
    • http://newborntaxidermy.com/uploads/1/3/0/2/130270986/nobiranuviratetenil.pdf
    • http://bitesizeworkouts.com/uploads/1/3/1/3/131380992/vojad.pdf
    • http://richardpainevo.com/uploads/1/3/1/4/131407535/forafafepuk.pdf
    • http://floreslima.net/uploads/1/3/1/8/131856907/terms.html
    • http://floreslima.net/uploads/1/3/1/8/131856907/dmca.html
    • http://floreslima.net/uploads/1/3/1/8/131856907/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pabozig.files.wordpress.com/2020/05/77985910223.pdf
    • https://xarefuwun.files.wordpress.com/2020/06/28851685230.pdf
    • https://bakovenorow.files.wordpress.com/2020/06/penelinimerot.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170a0.bin
6d6c172ece62320f81f327ea89c1c2469c355f9dc039003007c64efd00b6c068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170A0 13872 bytes

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