Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e9642916645888…

MALICIOUS

PDF

38.9 KB Created: 2020-06-04 18:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a55e7de1785a1d83b6cc2c43465343c SHA-1: 5a339142a68a13301e9e69c058d2dc1e3537bf45 SHA-256: 61e96429166458881f62e86673807114cc137fc64c80c362b660ef8846b58c51
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to potentially harmful web content.

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://wwwdaimondholiday.com/uploads/1/3/1/3/131384171/131384171.html#algorithms+by+dasgupta+papadimitriou
    • http://nwanimalhospitalnc.com/uploads/1/3/0/6/130620945/mupuro.pdf
    • http://modernmarketco.com/uploads/1/3/0/7/130738639/kofagi.pdf
    • http://terminaluno.org/uploads/1/3/1/3/131383204/baferoketikiwad-gobarem-movujifariri-gafalidaz.pdf
    • http://coffeescouts.com/uploads/1/3/0/5/130551174/pesubagujag.pdf
    • http://thejohnsonlaw.com/uploads/1/3/0/6/130604386/banuj-piwani.pdf
    • http://wwwdaimondholiday.com/uploads/1/3/1/3/131384171/terms.html
    • http://wwwdaimondholiday.com/uploads/1/3/1/3/131384171/dmca.html
    • http://wwwdaimondholiday.com/uploads/1/3/1/3/131384171/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wazipugakor.files.wordpress.com/2020/06/zerunupepikesosumilesul.pdf
    • https://sirumoki.files.wordpress.com/2020/06/tazatagejizimuf.pdf
    • https://mokelim.files.wordpress.com/2020/06/maviwemugoniwarurutorig.pdf
    • https://bidaleb.files.wordpress.com/2020/06/jofenesawoxu.pdf
    • https://nakavixolon.files.wordpress.com/2020/06/kojemujulax.pdf
    • https://motajixug.files.wordpress.com/2020/06/75102450366.pdf
    • https://zexegipofe.files.wordpress.com/2020/06/11743410745.pdf
    • https://sewenam.files.wordpress.com/2020/06/71185595517.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c96.bin
3787f3e83ef523fa4cff588e224dc9e5a5ba7cc6078ed0d352a8770ee5032185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C96 10760 bytes

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