Malicious PDF — malware analysis report

Static analysis result for SHA-256 10953d6528490bc2…

MALICIOUS

PDF

60.0 KB Created: 2020-06-18 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8fcfd72cebe0d4a4126982232314182 SHA-1: 13c837b22189c7a11acd7cde693d3f80a0f5179a SHA-256: 10953d6528490bc2808b969a07b28e75560d8411e377aad801d7159e8290d95f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://alexiswalker2000082250.com/uploads/1/3/0/5/130588841/130588841.html#private+dance+lessons+cambridge
    • http://lettercarrieruniforms.com/uploads/1/3/0/6/130605118/0fb8515f6.pdf
    • http://lendasherrell.com/uploads/1/3/0/5/130589269/6929975.pdf
    • http://zorzetboutique.com/uploads/1/3/1/4/131453170/giwedoj-dagopumenanufal-pifujomuze-fefofa.pdf
    • http://abettercleaningservices.net/uploads/1/3/0/7/130738778/2475293.pdf
    • http://hostmaster.oakforestflooring.co.uk/uploads/1/3/1/6/131636587/05704a1d.pdf
    • http://covidahome.com/uploads/1/3/0/4/130476385/4022720.pdf
    • http://accreditedcfo.com/uploads/1/3/1/0/131070355/3ce0d1869.pdf
    • http://ngaradonsolutions.com/uploads/1/3/1/4/131453630/woson-fezojed-larugor.pdf
    • http://h-i.co/uploads/1/3/1/3/131398575/a5f7f.pdf
    • http://dunkhilldrygoods.com/uploads/1/3/0/4/130476587/2987806.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008769.bin
445bb85dfd900bd707c8cc4f206bb7119ccffe6be691289386f94b93214484a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8769 5248 bytes
font_01_sfnt_off00009917.bin
38d6ebbe967f38af849ec1c6bd2e508785c83d2728ba940770dbe506a10051c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9917 3524 bytes
font_02_sfnt_off0000a757.bin
064bc8bf816883620339fc02ad152b65c694488339834da1b1685036149d54d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA757 11184 bytes
font_03_sfnt_off0000cdb4.bin
64cd0c23117398effe9fbc2b04334c43dfd778de5d0a2fcc917783872d5644b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 16188 bytes

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