Malicious PDF — malware analysis report

Static analysis result for SHA-256 1213391154eac533…

MALICIOUS

PDF

34.1 KB Created: 2020-05-26 19:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6fe9c87b0a05c55d553b9e12f542b2c SHA-1: 8ce6f40589ef3d5883e1cd1893c8528748076fa5 SHA-256: 1213391154eac533bc61fd49df4ea7c3cf0d8fb34efc238a59d6a371a41feb0c
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to redirect users to potentially malicious websites. The embedded URLs point to domains that appear to be part of a link farm, possibly for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of external links and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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://mianfeiwangluoqipaiyouxi.br3h.com/uploads/1/3/0/4/130488172/130488172.html#conan+exiles+spider+boss
    • http://allsaintsgreenville.net/uploads/1/3/0/8/130874318/ropedujuwiwuda_jadijedagowi.pdf
    • http://np4p.org/uploads/1/3/0/6/130621321/6568532.pdf
    • http://enjoythecbd.net/uploads/1/3/1/6/131606864/luxunijija.pdf
    • http://manipedisander.flex-sander.com/uploads/1/3/0/5/130590420/bakamitudiw.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005382.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5382 1800 bytes
font_01_sfnt_off00005c0d.bin
6b55d38ce3b793e794a83fb30e86efee97c5a925b764811889633f90407a3035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0D 9880 bytes

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