Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b6b5e6a06f30c8…

MALICIOUS

PDF

61.1 KB Created: 2020-05-16 23:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f7efdb751d7e8e8217d33242fde1b2 SHA-1: 6c08b989b3731469f6d55b80c71cb9d542808672 SHA-256: 30b6b5e6a06f30c80c290432f0adc88d8cc9d99af144b3e6eb4772c88c9a7f76
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://sweetestdreams.org/uploads/1/3/0/3/130323148/130323148.html#black+desert++character+creator
    • http://hmvmarketing.com/uploads/1/3/0/8/130814020/dfa86a5.pdf
    • http://renew-membership-netflix.com/uploads/1/3/1/3/131382274/8712132.pdf
    • http://onceuponacupofcoffee.com/uploads/1/3/0/8/130814935/rawakigeb.pdf
    • http://ecuapymes.ec/uploads/1/3/0/3/130313117/gerotiporenuw.pdf
    • http://sssrugh.com/uploads/1/3/0/6/130621552/c1dbec.pdf
    • http://carmonaframing.com/uploads/1/3/1/4/131483209/3115458.pdf
    • http://boston2ireland.com/uploads/1/3/1/3/131379253/8439671.pdf
    • http://aasoftballclub.com/uploads/1/3/0/6/130604858/8251047.pdf
    • http://viiasaunas.com/uploads/1/3/0/2/130287991/venopenixem_zuxananogawuba.pdf
    • http://thewillowdalefarm.com/uploads/1/3/0/5/130551186/fagisupi_garalikelujiji.pdf
    • http://sacredstarastrology.com/uploads/1/3/0/6/130620578/c73229c.pdf
    • http://jamesfabionar.com/uploads/1/3/1/4/131452902/gepetolu.pdf
    • http://sellmystuffkaren.com/uploads/1/3/0/6/130604782/8c1def64b193f.pdf
    • http://bostonwoodwindstudio.com/uploads/1/3/0/5/130551551/zoduzukamuniwuzaxog.pdf
    • http://firstclasspens.com/uploads/1/3/1/6/131636719/1a02d5b28.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_off0000ad04.bin
c88841cdc2d851f518a8a07f012530de53d130b528f3c45c3f447476613ef58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD04 11084 bytes
font_01_sfnt_off0000d337.bin
1ff76b967cdf3bc4238cb8097aa9d4755c8fb5bd66c4cf01391f6e70ad1e9315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 16192 bytes

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