Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e122e651b43358…

MALICIOUS

PDF

45.6 KB Created: 2020-06-02 07:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88715d2cba8e5ba1ec7e720dd8f6e26 SHA-1: d9dcc6bc350c68750b7544d8d88d2ddd0233a805 SHA-256: c9e122e651b43358f1bce0351e85ac55011d06e42e17ab18f41dcae995fe65ac
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text that appears to be metadata and a lure related to 'why suya sing pdf', along with the authoring application information. The primary attack pattern involves directing users to a network of linked PDFs, likely for SEO spam or to host further malicious content.

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://coolcaribbeanvacations.voyagerwebsites.com/uploads/1/3/1/6/131637482/131637482.html#why+suya+sing+pdf
    • http://trieceyshouseofmusic.com/uploads/1/3/0/6/130621582/23341b0772.pdf
    • http://originalmagicslicertrio.com/uploads/1/3/0/8/130813381/7638566.pdf
    • http://blorstravels.com/uploads/1/3/0/3/130313208/zajiserexe_nujorug.pdf
    • http://chrismintchev.com/uploads/1/3/1/1/131163878/e67363a84.pdf
    • http://kmbproductions.com/uploads/1/3/0/6/130604205/7596769.pdf
    • http://shred-media.com/uploads/1/3/0/5/130540897/xaxutitapigufakuje.pdf
    • http://newquayairportspotting.co.uk/uploads/1/3/0/5/130590569/tunakofubetanax.pdf
    • http://coolcaribbeanvacations.voyagerwebsites.com/uploads/1/3/1/6/131637482/terms.html
    • http://coolcaribbeanvacations.voyagerwebsites.com/uploads/1/3/1/6/131637482/dmca.html
    • http://coolcaribbeanvacations.voyagerwebsites.com/uploads/1/3/1/6/131637482/policy.html
    • https://lubaxop.files.wordpress.com/2020/05/16051778239.pdf
    • https://nopobulaz.files.wordpress.com/2020/05/xazalavebudifoxivezinoriv.pdf
    • https://kodelemepopi.files.wordpress.com/2020/05/zisawige.pdf
    • https://lexovasa.files.wordpress.com/2020/05/48566665158.pdf
    • https://riwozuxel.files.wordpress.com/2020/05/salitomoxikavaki.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_off000084e5.bin
c8774168e3cc097ad6056c6494d80ce963acbf1b0ed10aced7f0bfe3f61a26f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E5 11792 bytes

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