Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaa5831aac06c5d…

MALICIOUS

PDF

40.7 KB Created: 2020-04-01 13:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e891ee521596fd6eeb58280efd3b4e1 SHA-1: acc54e588901ba83c38ab69f2319aedc70e375e3 SHA-256: dbaa5831aac06c5ddcdc8136228b5e58cb4ad774183a6c9c3c57530431e6c1eb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. The document body, though partially corrupted, contains references to these external URLs, suggesting a link farm or redirection scheme designed to lead 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://genzsupreme.com/uploads/1/3/0/3/130323106/130323106.html#antecedentes+de+la+informatica+en+mexico
    • http://utasempfassociates.com/uploads/1/3/0/5/130588164/bubazibivami_widiwulot.pdf
    • http://clutterfreefreedom.com/uploads/1/3/0/6/130605159/keponix_gezapotajiko_wajobar_juporel.pdf
    • http://aspirecrossfit.com/uploads/1/3/0/5/130539928/6687e5ad1f46.pdf
    • http://scarlettsbowcompany.net/uploads/1/3/0/3/130323477/dimejo.pdf
    • http://freedompowerwashing.com/uploads/1/3/0/4/130475925/0fb362f7fd6a24.pdf
    • http://tssfarm.org/uploads/1/3/0/5/130551433/5bd02035b4.pdf
    • http://ashleyklemmbirthservices.com/uploads/1/3/0/5/130589216/buwojurugob-dixonoxeb-wokug-pedafejebusere.pdf
    • http://eamjewelry.com/uploads/1/3/0/6/130622066/kesanamel_numozub_padeja.pdf
    • http://tonyacreasmanart.com/uploads/1/3/0/7/130775950/fbf5d.pdf
    • http://pleasantoneducation.org/uploads/1/3/0/4/130494172/rodizop_pozasevivixo_vokujeriku.pdf
    • http://cakes-bymaira.com/uploads/1/3/1/3/131381542/1106712.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_off000074f8.bin
21113e79db6dc9b3f6a262aa5b837557ee06ea3d9004ab03a308c833794d3d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 8728 bytes

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