Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48f6f8fb378e2e3…

MALICIOUS

PDF

41.7 KB Created: 2020-06-05 09:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 346ae7ded8014ab54d5beee4c1176985 SHA-1: 7b1226761f44dcd364863e5ab89d62e16e99a27a SHA-256: b48f6f8fb378e2e30dea0b39dfe7e8fff6ce62d3cd5f19f5fc5e5f466093e9d0
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings. The document body explicitly mentions adult content and includes URLs that lead to websites with similar themes. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sequoia77.pleasingfood.com/uploads/1/3/0/6/130604940/130604940.html#newest+lesbian+porn
    • http://webdisk.cubexsystem.com.au/uploads/1/3/0/4/130483737/4adebdb4a95ced6.pdf
    • http://iamprolife.blog/uploads/1/3/0/4/130476378/2517749.pdf
    • http://moninghoff.crosley.com/uploads/1/3/1/3/131379246/lelumap.pdf
    • http://ryleemackenzie.com/uploads/1/3/1/4/131437350/togedowavivuv.pdf
    • http://seabreezelawncare.com/uploads/1/3/0/3/130323723/a436843.pdf
    • http://sequoia77.pleasingfood.com/uploads/1/3/0/6/130604940/terms.html
    • http://sequoia77.pleasingfood.com/uploads/1/3/0/6/130604940/dmca.html
    • http://sequoia77.pleasingfood.com/uploads/1/3/0/6/130604940/policy.html
    • https://kemujemurer.files.wordpress.com/2020/06/xoxazefelekimorolu.pdf
    • https://xuzasus737655685.files.wordpress.com/2020/06/xitedekumojevofimebupaden.pdf
    • https://lavejolavazo.files.wordpress.com/2020/06/6406104028.pdf
    • https://nanajubedod.files.wordpress.com/2020/06/77672008519.pdf
    • https://sakeweter812408916.files.wordpress.com/2020/06/93859642437.pdf
    • https://fapesuj.files.wordpress.com/2020/06/xusegomivejigekazofek.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_off000077dd.bin
2e48174045daa84e2d42c963e0aa57f011bb50b29a83a70d299d4f14d729ee6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DD 10596 bytes

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