Malicious PDF — malware analysis report

Static analysis result for SHA-256 46510e4f959d213c…

MALICIOUS

PDF

120.5 KB Created: 2021-02-25 10:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a8270004a18daa49248ec2a3a242dce1 SHA-1: c81921299c03f28ac84a96fdeee7b0872273e71b SHA-256: 46510e4f959d213c06fda5757605314e7d7ab566f03d13fc22244b8fa5660f81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://jottigo.ru/strik?utm_term=comentario+b%25C3%25ADblico+mundo+hispano+salmos+pdf PDF link annotation
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/sedezejujoke-xatawebozot-gepukalebada-davarafilot.pdfIn PDF document text
    • http://instasurprise.online/55930889397kwjbh.pdfIn PDF document text
    • https://cdn.sqhk.co/dugabolisuma/thimjeJ/48765348924.pdfIn PDF document text
    • http://xamakag.iblogger.org/xiwumidogelava.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/faneruvigafuporabed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kogosez.epizy.com/manual_usuario_samsung_galaxy_buds.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/xewumewonobex.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/72541059630.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/three_tier_architecture_data_warehouse.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gixefefi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19865 5492 bytes
SHA-256: e3fb05896c3c32c99a87ff804865e1c6cd2dee34065e880ae210c6e3f3dbff0c
font_01_sfnt_off0001aadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AADB 12504 bytes
SHA-256: de4b2a18d04d6730bb81c39f3b4db4e7af80e0f26e550fc9daa7e828fe3d7b10