Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b73334a5686cbc3…

MALICIOUS

PDF

35.5 KB Created: 2020-03-27 10:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6344f33bba0a4f6bda084a85e79e2ebc SHA-1: 0416b843d94fb673a65f81295cfde44376484e1c SHA-256: 5b73334a5686cbc34a3f07e15c75c7b2bfd02b715813deed460f8a37959e599a
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, indicating the document's primary purpose is to drive traffic to these external resources. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

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://alphadogs187.com/uploads/1/3/0/7/130740017/130740017.html#kenmore+vacuum+repair+manual
    • http://embroidesign.net/uploads/1/3/0/7/130738902/3155750.pdf
    • http://manbookhandbook.com/uploads/1/3/0/6/130640031/2205566.pdf
    • http://htxheli.com/uploads/1/3/0/2/130271080/varagujorokexi.pdf
    • http://trigamedesign.com/uploads/1/3/0/5/130588288/6976310.pdf
    • http://thegeorgiaquailhunt.com/uploads/1/3/0/7/130775747/1345164b6.pdf
    • http://www.everythingdmvradio.com/uploads/1/3/0/2/130289453/8de84b8e.pdf
    • http://safetyhucs.org/uploads/1/3/0/6/130639958/vulikavibesikimadibi.pdf
    • http://www.dannyderrick.com/uploads/1/3/0/2/130288811/c8c54e17e.pdf
    • http://tnconcealedcarry.com/uploads/1/3/0/7/130738831/nakuxuminofopi-betoz-zutemusakal.pdf
    • http://www.charlottetrolley.org/uploads/1/3/0/5/130542964/vamowesag-soleb.pdf
    • http://medicalmalpracticegeorgia.com/uploads/1/3/0/8/130814492/naxexugarowavi.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_off00006265.bin
55cbea9b716e6857be2b0d67512f75ac18ad27139fe8b9e0e624bf949f7f43fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6265 7400 bytes

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