Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4603a490dfd3b2…

MALICIOUS

PDF

45.0 KB Created: 2020-04-11 22:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 518e1d978563f7f4aca58f6a075f059b SHA-1: e2a95c704930ca67da2288ad3bf42675e7bf01f0 SHA-256: 0c4603a490dfd3b22d8c75448bb85d2237deb2d4059467933f0864aa7f5ab58b
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest it is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://jirsaenterprise.com/uploads/1/3/0/9/130969322/130969322.html#what+did+the+budget+and+accounting+act+of+1921+created
    • http://dearienphotos.com/uploads/1/3/1/1/131163864/e7f437be808f.pdf
    • http://justinfrazierrealty.com/uploads/1/3/0/4/130436028/884f798d.pdf
    • http://hostmaster.apof.eu/uploads/1/3/1/1/131164452/1737517.pdf
    • http://fixoo.ca/uploads/1/3/0/7/130776611/1745caa1a08.pdf
    • http://goldengearcustoms.com/uploads/1/3/0/5/130590567/8144920.pdf
    • http://nhfrea.org/uploads/1/3/0/7/130739747/zemowoxivuxa.pdf
    • http://majicdj.com/uploads/1/3/0/4/130476270/jojobure.pdf
    • http://optikdworschak.at/uploads/1/3/0/2/130271185/xitalilomalos.pdf
    • http://taurusbulldesigns.com/uploads/1/3/0/2/130273576/roxaferuxelagetumixe.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070d9.bin
3eb85d3d20914954d8f5bdb9f63a5fc413c872b73a1b03b9ff4ea865339ffe2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D9 8252 bytes
font_01_sfnt_off000090ae.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90AE 16036 bytes

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