Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bccfaac505f07b…

MALICIOUS

PDF

32.8 KB Created: 2020-06-03 08:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e2a13326f09c31629f03a3d997d5dd SHA-1: 8340a5e03fe1b5d979cc2f6c0a46d1e51ec991e8 SHA-256: 79bccfaac505f07baa24b2243252068bb8bc5f1da95d4adfad981661fa8f74b9
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as potential malware distribution points. The document body text, though partially corrupted, includes a lure related to downloading music, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links.

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://yatra-journeys.com/uploads/1/3/1/1/131164004/131164004.html#baixar+musicas+discoteca+anos+70+e+80+gratis
    • http://privateiheadquarters.net/uploads/1/3/1/3/131380251/f0f2ce4ee60.pdf
    • http://gratitudehouseboat.com/uploads/1/3/1/8/131871670/fa66ff588a4718e.pdf
    • http://noquest.co/uploads/1/3/0/9/130969500/58f3652103.pdf
    • http://theseven16live.com/uploads/1/3/0/4/130488834/4109b1.pdf
    • http://ryelcleanoutservices.com/uploads/1/3/0/8/130813077/1738742.pdf
    • http://gotgravel.com/uploads/1/3/0/5/130551046/mosefekelino_nukado_musevituropi_zejokanemafe.pdf
    • http://kingartsy.com/uploads/1/3/1/4/131453576/9aa328af3.pdf
    • http://historicfoodways.com/uploads/1/3/0/4/130488584/5257788.pdf
    • http://kittitascarshow.com/uploads/1/3/1/4/131454522/natavivagubefab.pdf
    • http://yatra-journeys.com/uploads/1/3/1/1/131164004/terms.html
    • http://yatra-journeys.com/uploads/1/3/1/1/131164004/dmca.html
    • http://yatra-journeys.com/uploads/1/3/1/1/131164004/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fisekutaw.files.wordpress.com/2020/05/3259833900.pdf
    • https://jadulotixen.files.wordpress.com/2020/05/5462195795.pdf
    • https://xejolaxutibu.files.wordpress.com/2020/05/24955101767.pdf
    • https://koropezanuxe.files.wordpress.com/2020/05/dojonufilosumikotuki.pdf
    • https://jupeveni.files.wordpress.com/2020/05/78659820437.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_off00005115.bin
5b832fcf631bd0d23c50cb3151ed1a6bc18a7660c14dc6e3e6607180acb0acf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5115 11464 bytes