Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc84929756e7d8a…

MALICIOUS

PDF

30.6 KB Created: 2020-04-24 17:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7e329fa3282a4a5e1b09510d7894272 SHA-1: dc4ab6d07c36f1ba50ab26e5dd3f42a59a7f2af3 SHA-256: ecc84929756e7d8ae1a47e097858f8753b7a4707d32522bb7d8db3ca3105d8d7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially leading users to malicious sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://retrobikesdublin.net/uploads/1/3/0/4/130488165/130488165.html#capability+maturity+model+ppt+template
    • http://mahaservice.net/uploads/1/3/1/3/131379948/lexuboselikukorar.pdf
    • http://ribhaus.se/uploads/1/3/0/6/130604487/da9be8ab.pdf
    • http://findingsmarket.co/uploads/1/3/0/9/130969183/meluboxalin.pdf
    • http://alykhan.info/uploads/1/3/1/4/131438840/8c25cd484c4.pdf
    • http://krutimodekurty2017.com/uploads/1/3/1/4/131437728/dozezutu_vozujule.pdf
    • http://permezone.com/uploads/1/3/0/2/130273762/vazaxodos-nenevemutuloja.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_off000050a0.bin
ffe83444ad289dd6185d8670a8af237252f8e2534d1bb36d6eb5098367669db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50A0 7668 bytes

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