Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80be66d14e2407e…

MALICIOUS

PDF

36.6 KB Created: 2020-04-04 10:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c904eeaddf5eb9af741eae5cc75eab4f SHA-1: 4b226c266b9298063a875b57b5fd603d1058b4cc SHA-256: e80be66d14e2407eef61bc170cb405f31811b86260185b6be7aa675682d315eb
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF documents, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The primary lure appears to be the text 'Victory gymnastics san diego', which is likely a deceptive title to encourage clicks on the embedded links.

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://amarefinds.co/uploads/1/3/0/9/130969237/130969237.html#victory+gymnastics+san+diego
    • http://www.coonrapidsinsurance.com/uploads/1/3/0/2/130273804/6338086.pdf
    • http://therealrealtor.info/uploads/1/3/0/8/130874240/cf7f32.pdf
    • http://adaccongoongasbl.org/uploads/1/3/1/0/131070596/1727613.pdf
    • http://reliable-assoc.com/uploads/1/3/0/8/130873796/zamosaso_sepez_momogapuwoberu_navofo.pdf
    • http://happybirthdayhasna.me/uploads/1/3/0/7/130738955/tanorukufa.pdf
    • http://mcfallconstructionco.com/uploads/1/3/0/4/130476974/soradegibiba-saxipikarapa-kudikugovabe.pdf
    • http://ginger-bear-designs.com/uploads/1/3/0/9/130969190/kulan.pdf
    • http://balbellewconsultancylimited.com/uploads/1/3/0/8/130874408/gesok.pdf
    • http://homeinspectionsolutions-mt.com/uploads/1/3/0/5/130550844/3ef7b82dfe.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_off00006559.bin
0f20cb4adbe70181f39bb59fef1be46d9f9887f36d0c39276b6a66c415b35508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 8524 bytes

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