Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f556deae27cc34c…

MALICIOUS

PDF

36.0 KB Created: 2020-04-18 12:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 00ee419d9c31abd55eeab3887f08cc11 SHA-1: 7dbb97009fb1622df715ead4d21ee6acd763c27c SHA-256: 5f556deae27cc34c3a8af493ac781adaf32d6fca6732e5bce499e98fca880182
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO spam or distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, suggesting a link farm or a similar malicious scheme. The embedded document body text, though corrupted, contains a URL that matches one of the extracted IOCs, reinforcing the link-based attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://thegrandpreserve.com/uploads/1/3/1/4/131453027/131453027.html#july+2016+calendar+spreadsheet
    • http://ageorgelibnat.com/uploads/1/3/0/6/130604860/vebabonadubupez.pdf
    • http://fayvah.com/uploads/1/3/0/4/130489001/vevutubolatov.pdf
    • http://bowiejournalism.com/uploads/1/3/0/8/130874136/daxizukeludawi_zimipoler.pdf
    • http://northbaby.net/uploads/1/3/0/6/130621890/kozoxawupusibu-vokiratode.pdf
    • http://schoolofslide.com/uploads/1/3/1/4/131406895/b20fb1446.pdf
    • http://eifel-vakantiehuis.com/uploads/1/3/1/3/131381819/daroti-jidiku.pdf
    • http://engagemealprep.com/uploads/1/3/0/3/130313453/2610099.pdf
    • http://cotswoldmarketgarden.com/uploads/1/3/0/8/130814851/depotuwu_fosaguw.pdf
    • http://casabellefille.net/uploads/1/3/0/4/130436108/womovufe.pdf
    • http://shakeyoursoulsong.com/uploads/1/3/0/5/130588380/garawigo.pdf
    • http://dazzlingproductions-inc.com/uploads/1/3/1/4/131438562/6808452.pdf
    • http://brooklynnelza.com/uploads/1/3/0/6/130639073/zemum.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000623c.bin
8f33e97a88c8a7f6d7f3250c9879d5d5e5cebe015db08776ec2f54bbd417584a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 8272 bytes

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