Malicious PDF — malware analysis report

Static analysis result for SHA-256 184d4449f29e9ced…

MALICIOUS

PDF

40.6 KB Created: 2020-04-09 08:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0392d0b39af2142d91429b73fddce97d SHA-1: 2cbca8923ad63de367d50eed323b71887c464129 SHA-256: 184d4449f29e9ced1180e2652c214cc401098bdac158ac0da0841d8da54eb29b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text suggesting it is a manual for a 'Yamaha remote start kit', which is likely a lure. The ML classifier strongly indicates maliciousness, and the presence of many unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kelsrodandreel.com/uploads/1/3/0/6/130603900/130603900.html#yamaha+remote+start+kit+for+ef3000iseb+generator
    • http://sylvialeconsulting.com/uploads/1/3/0/8/130813829/f54c85f109.pdf
    • http://bibicapital.com/uploads/1/3/0/6/130620845/8b371f1e86db.pdf
    • http://khamoshiarts.com/uploads/1/3/0/7/130739258/2706430.pdf
    • http://mpsi-yar.ru/uploads/1/3/0/2/130289427/9b74453f8779e.pdf
    • http://lulusboutique.net/uploads/1/3/0/5/130551986/64e0ec53f1b5cc.pdf
    • http://cowboysoriginals.com/uploads/1/3/0/5/130551015/gabetetopawip.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_off000074ee.bin
fbf2415c6bb52d64557014007cf241456a53ea52e2180008ccecc3fdb7e58b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EE 8516 bytes

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