Malicious PDF — malware analysis report

Static analysis result for SHA-256 6335e10d2aa87018…

MALICIOUS

PDF

40.3 KB Created: 2020-04-19 11:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7ee74eea85c96aadfcac06a1d2114cee SHA-1: 817746f44abaf616d8cb47a6719a94c65e7287ae SHA-256: 6335e10d2aa8701823c15de1a7a6a7e66c40952fc25f13bda114996f1188eafd
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, indicating a potential link farm or distribution mechanism for further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to redirect users to potentially harmful sites, possibly disguised as legitimate content like 'bodybuilding recipes'. The file's structure and numerous external links are indicative of a malicious document designed for obfuscation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://datanetguatemala.com/uploads/1/3/0/9/130970005/130970005.html#bodybuilding+recipes+pdf
    • http://wisconsinhomes4sale.org/uploads/1/3/0/4/130436145/buwazamezago_fodur_bigojanafeveva.pdf
    • http://theatriumcafe.com/uploads/1/3/0/4/130488694/dosudojugosites-nomufejibotole-vademaf.pdf
    • http://seballospastries.com/uploads/1/3/0/7/130739243/045bcb25d9c4d9.pdf
    • http://goldntone.com/uploads/1/3/0/9/130969700/memelisakebile_puxawiluwisida.pdf
    • http://affordablepetfeeds.com/uploads/1/3/1/4/131482884/c9d16.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd7.bin
78422a99ee0f6c9ca665a6d8c22f406ad466333955e9572b01a6057a5d46e67c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD7 8408 bytes
font_01_sfnt_off00008c16.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C16 2652 bytes

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