Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66260a544635e24…

MALICIOUS

PDF

38.6 KB Created: 2020-04-08 08:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10757f665b22820426d580309c039c35 SHA-1: 80e6966341b2b78c9a616dadcab66d04d63862f3 SHA-256: b66260a544635e2437fe0a92c79d3d3f6584d10f1a5ccdac01ce6076c1f67f3e
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, which strongly suggests a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains a URL that is also present in the list of extracted URLs. No scripts were extracted from this sample.

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://audiofidelity.no/uploads/1/3/0/9/130969184/130969184.html#what+can+cord+blood+stem+cells+be+used+for
    • http://controlitconsulting.net/uploads/1/3/0/5/130545189/refopi.pdf
    • http://luxuryhomesarchitect.com/uploads/1/3/0/5/130551141/38a3482196.pdf
    • http://hiltonheadislandchurch.org/uploads/1/3/1/3/131380236/fed42.pdf
    • http://hkshax.com/uploads/1/3/0/5/130588237/5009037.pdf
    • http://madtama.com/uploads/1/3/0/9/130969559/15f96d4.pdf
    • http://teamdoulawestlondon.com/uploads/1/3/0/7/130739362/4686357.pdf
    • http://natethehousewhisperer.net/uploads/1/3/0/4/130476074/3f2b7c9a4.pdf
    • http://indulz.ca/uploads/1/3/0/9/130969018/464a503b01fa.pdf
    • http://brainstormembroidery.com/uploads/1/3/0/7/130775318/fawixanez.pdf
    • http://lightsoutfof.com/uploads/1/3/0/8/130874455/xetadijatirurumi.pdf
    • http://speedyinsuranceofillinois.com/uploads/1/3/0/6/130604823/6800064.pdf
    • http://kosherinchina.com/uploads/1/3/1/3/131384214/0d773614ffc51.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_off00006ea9.bin
b76aa3bea891de9486d0976299dac595fbe44271bf8553b358f5143cad231e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA9 8388 bytes

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