Malicious PDF — malware analysis report

Static analysis result for SHA-256 c506abf34d8c7c4a…

MALICIOUS

PDF

37.9 KB Created: 2020-06-20 07:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 214994bb4a53fe0e0e184ca7d7fa0a6c SHA-1: a8d51515d63d2470109c4c5db82902bab2f997af SHA-256: c506abf34d8c7c4a1a0ecd4fa0136ec1d3894ff9705afff52a99c15f933a214f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains references to 'chest fat burning exercises' and includes URLs, suggesting a lure to a link farm or potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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://tianaskitchen.com/uploads/1/3/0/7/130739876/130739876.html#best+chest+fat+burning+exercises
    • http://mta-sts.mail.mrk9inc.org/uploads/1/3/0/5/130543141/dcea756a51ea65.pdf
    • http://zahra-haghiri.com/uploads/1/3/1/6/131636834/a946254.pdf
    • http://mta-sts.mail.i-kandytattoo.com/uploads/1/3/1/3/131380598/ac81aac0b0d.pdf
    • http://hostmaster.mediclin.be/uploads/1/3/0/9/130969918/gidovefamiwuvob.pdf
    • http://zakis-filmtierakademie.com/uploads/1/3/0/5/130539518/telovi.pdf
    • http://dunkhilldrygoods.com/uploads/1/3/0/4/130476587/2987806.pdf
    • http://mta-sts.rjgehringer.com/uploads/1/3/1/4/131407797/8754495.pdf
    • http://gwo-international.org/uploads/1/3/0/6/130620417/tawanozadujato.pdf
    • http://sirtrillmusic.com/uploads/1/3/1/6/131637409/1e3689d935d.pdf
    • http://adriaticexpressllc.com/uploads/1/3/0/5/130590384/21576065c.pdf
    • http://kalimatthews.com/uploads/1/3/0/5/130551416/88deb.pdf
    • http://mta-sts.jonickonline.com/uploads/1/3/0/8/130814195/diduj-junuget-xamulerudirix-jibuno.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005773.bin
4f7e0133b626cc2039e2f7a3b60715bbaa3e35e9d3d9133331db629d86ab7c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5773 5140 bytes
font_01_sfnt_off000068f0.bin
49fd23cdc6330e0845de38c65d05bb86ce9c6da855cd8a394bdb0e13ce39494e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 9944 bytes

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