Malicious PDF — malware analysis report

Static analysis result for SHA-256 3644dfbe33bcc1c8…

MALICIOUS

PDF

31.0 KB Created: 2020-04-28 22:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2629d71680f193f4f96711451841ca04 SHA-1: 0a9fc27de2c16b8ca23dc1fd571769a1403fecb7 SHA-256: 3644dfbe33bcc1c899102a951c55536c544ac98a101da787e34ac75c70c15b9f
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to domains that appear to be part of a link farm or SEO manipulation scheme. The ML classifier strongly indicated maliciousness. The document body text is minimal and appears to be obfuscated or irrelevant, suggesting the primary malicious function is to redirect users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kylaconner.com/uploads/1/3/0/3/130313215/130313215.html#outfits+formales+para+gorditas
    • http://queencityptg.com/uploads/1/3/0/6/130604850/pinalijawofazenop.pdf
    • http://dolfroksvoetbal.com/uploads/1/3/1/1/131164317/wetulosek.pdf
    • http://sofiamarllc.com/uploads/1/3/1/3/131380415/xevuv.pdf
    • http://rsmworkplace2020.com/uploads/1/3/1/6/131606027/figinep_xugotiwepusozaf.pdf
    • http://shorelinedesigners.com/uploads/1/3/1/1/131163786/betuferened-vibizem.pdf
    • http://haventruck.com/uploads/1/3/1/3/131383673/5b12051a3b5c584.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_off0000536f.bin
c9a9d6fb1bbb54921bcbef878377031b12b97f461ee10efe6e8e6fe8057999c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536F 7828 bytes

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