Malicious PDF — malware analysis report

Static analysis result for SHA-256 69924cbd15c985fd…

MALICIOUS

PDF

37.8 KB Created: 2020-06-19 11:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43a7dd49a3aeaba8c24f7a6262fb7a7c SHA-1: 28c3051964205ef31e6484501d3293534c7d86c8 SHA-256: 69924cbd15c985fd9b680dba33cc65e3ba8d4b8c9cfc5b8dbd842ac07d5db101
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of numerous external URLs indicates an attempt to direct users to potentially malicious or spam-related content. The ML classifier also flagged this PDF as malicious with high confidence.

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://hostmaster.sarahssensationalsweets.co.uk/uploads/1/3/0/5/130539726/130539726.html#python+create+pdf+from+html
    • http://mta-sts.mx.dh-studio.com/uploads/1/3/0/3/130323255/45225eef.pdf
    • http://6thfloormusic.com/uploads/1/3/0/4/130476351/jokimawuvexitokizi.pdf
    • http://santawes.com/uploads/1/3/0/5/130551720/5621653.pdf
    • http://mnguidedgoosehunting.com/uploads/1/3/0/4/130477372/pudirob-webopodepim-dunaxa.pdf
    • http://3m2.undesirable.us/uploads/1/3/1/4/131453415/pidorilemokeliwojipu.pdf
    • http://cpcontacts.jkinsectcollection.com/uploads/1/3/0/5/130590186/vuvugokurid_foxusirevodewu.pdf
    • http://rimasrl.facile.hosting/uploads/1/3/0/4/130492038/2679364.pdf
    • http://webdisk.onebigtreedesigns.com/uploads/1/3/0/5/130543761/radateb_tilakalabum_banugu_firuvamekax.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_off00005642.bin
65a67da5e80bf7aa1ecac4be3bf20de0d37148a0ad21827e35b6008064ea8b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5642 5060 bytes
font_01_sfnt_off00006746.bin
530bb533a0598f4210fc1854ece999c1c69a6db2a8a67721cdacf56e094ee368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 10408 bytes

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