Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a38d47e05de1da5…

MALICIOUS

PDF

39.2 KB Created: 2020-05-19 18:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fbace86ae6bff4fc50d15b8a891be06 SHA-1: d59369b9e1d3ab1fffc93607c216c45f61433882 SHA-256: 1a38d47e05de1da561652c59c03e89eaab593a44c25dd6416196efc0e5c53bdf
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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://beaverdamchurchonline.org/uploads/1/3/0/2/130272575/130272575.html#livro+geologia+de+barragens
    • http://nepservicesinc.com/uploads/1/3/0/6/130621240/5f239de1.pdf
    • http://mrsgillsfirstgrade.com/uploads/1/3/0/6/130604798/855847.pdf
    • http://jjhomez.com/uploads/1/3/0/9/130969446/2771307.pdf
    • http://jimandlindacox.com/uploads/1/3/0/7/130739492/7502968.pdf
    • http://hawkfacultyunite.com/uploads/1/3/0/6/130620690/sakibiliwexu-jatulitodox-surubapawob-doxosugu.pdf
    • http://centralstockcare.com/uploads/1/3/0/5/130539243/a6f9a90.pdf
    • http://g3bcn.com/uploads/1/3/0/5/130589353/7475009.pdf
    • http://believezevenbergen.com/uploads/1/3/0/4/130490193/bitonetenesegitowujo.pdf
    • http://bentleysearch.net/uploads/1/3/0/9/130969222/vopomakokiwakija.pdf
    • http://roofing-marketers.com/uploads/1/3/1/4/131483343/fubenogexuzizux_vubotimujoduvux_zoduw.pdf
    • http://aimeelora.com/uploads/1/3/1/4/131437261/figuzutupe.pdf
    • http://floorforce3.com/uploads/1/3/1/4/131406361/xoterumagigawa.pdf
    • http://gracelinesforestbathing.com/uploads/1/3/0/8/130815115/e91c3fc.pdf
    • http://rhinotruckparts.com/uploads/1/3/0/2/130271072/favax.pdf
    • http://cortkrekoullc.com/uploads/1/3/0/2/130273762/midifajagedef-vanuti-dorixuroteteg.pdf
    • http://eyebrwsbdycare.com/uploads/1/3/0/6/130639779/2714050.pdf
    • http://elkhorn45.org/uploads/1/3/1/3/131398252/56474460d434bc5.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_off00006851.bin
334c078119618b03bab469eb7d3fb3723895ab8d799b88b19f4af63586ffb7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 13312 bytes

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