Malicious PDF — malware analysis report

Static analysis result for SHA-256 5686632158b08b31…

MALICIOUS

PDF

42.2 KB Created: 2020-05-31 03:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4eff0e07ce42266c0ff7d58222fba72 SHA-1: d5db11772ab8c758037743eb89d0473c93218c3f SHA-256: 5686632158b08b316e562e4ec059b100ab904b5e7361b1a2e4d6c42d1576f61f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unrelated domains and appear to be part of a link farm designed to manipulate search engine results. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a lure to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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://naturalhealthsol.info/uploads/1/3/1/6/131606203/131606203.html#acer+nitro+an515-+51
    • http://firehouse-fashion.com/uploads/1/3/1/4/131408062/wumubimew.pdf
    • http://electricbicycleassociation.com/uploads/1/3/1/4/131453832/jokez-felasepa-sepajoridakizo.pdf
    • http://healthinyourlife.co.uk/uploads/1/3/0/5/130544547/4811499.pdf
    • http://demigracesblog.com/uploads/1/3/1/8/131871657/fb189f3.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_off000054ff.bin
5ad42d5e1c5a7496e9e2f9dab0830d94df74d2b4e25e61829715ccc81c558e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FF 23076 bytes
font_01_sfnt_off000087f6.bin
0f4ca07f8ee53d8de3b707a7ee80e8af137320f04e4d1aee71e6421d3c0f7a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F6 16064 bytes

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