Malicious PDF — malware analysis report

Static analysis result for SHA-256 0838e558bde1c11e…

MALICIOUS

PDF

41.8 KB Created: 2020-06-17 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac53d0576e815767da159da750562ce0 SHA-1: e5a38125500e9f62abff357102308ac55999eb95 SHA-256: 0838e558bde1c11e145decc95324bab77b250d5da440a7ee30e43df082fc6339
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded document body text and extracted URLs indicate a likely attempt to manipulate search engine results or lead users to potentially harmful 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://littleoakdoula.com/uploads/1/3/0/5/130590224/130590224.html#webfoot+guide+service
    • http://mymedicarespot.com/uploads/1/3/0/2/130272250/faxoviremupokinanake.pdf
    • http://hostmaster.kaitlynschatch.com/uploads/1/3/1/4/131483118/7981894.pdf
    • http://manortreasures.com/uploads/1/3/1/8/131871462/8780142.pdf
    • http://driveverywellthistruck.org/uploads/1/3/0/5/130539054/7016896.pdf
    • http://mx.ethanmcgrath.com/uploads/1/3/0/5/130551186/korurevejoveb.pdf
    • http://heretotherecampaign.org/uploads/1/3/0/6/130604049/4464715.pdf
    • http://cpanel.cabincreekfarmstudio.com/uploads/1/3/1/0/131070566/gadorusupomob_vebate_janejati.pdf
    • http://socialsf.com/uploads/1/3/0/5/130539718/ca5cd.pdf
    • http://blackportholdings.com/uploads/1/3/0/3/130379458/be2f11fa06f725.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e1.bin
b9de6346a99406ea7a7fca1b01c60eb20ab8fe1aae5d7352edb36b23633d1d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E1 4936 bytes
font_01_sfnt_off000077dc.bin
993ee1a18d7282a549a50c49cad7d8919a3be37a094e87ed09e0348fdd111ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DC 10404 bytes

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