Malicious PDF — malware analysis report

Static analysis result for SHA-256 794c03b1db4712f4…

MALICIOUS

PDF

38.9 KB Created: 2020-11-09 09:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9be479f08446300df34833d65f246498 SHA-1: 391281de93c9ad217bd4259775740a784ed23709 SHA-256: 794c03b1db4712f4989d754e08e1331ce825e6cccdedf8748c3d635000a73e49
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://trafftec.ru/wb?keyword=gloucester%20county%20championship%202019, is flagged as an external URI. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing sites.

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 https://trafftec.ru/wb?keyword=gloucester%20county%20championship%202019 PDF link annotation
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/miniwaviwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xixunetov.files.wordpress.com/2020/11/52861535426.pdfIn PDF document text
    • https://nuvinifiraf.files.wordpress.com/2020/11/mach_zehnder_interferometer.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/star_wars_lords_of_the_sith_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9a1fe7-3953-4d73-aa86-9f62ef7534b6/dakenoturuxenoritodelije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633c49d3-bd09-4a0e-88cf-14007525cacb/tree_of_tranquility_gift_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/potivefotofetenove.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/independent_events_probability_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f93da0-363e-426e-983d-ae5110ef36b9/53280698452.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/wellpinit_school_district_wa.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/axis_direct_charges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89076fa-9966-4f79-b973-0820dcf5f290/realm_grinder_passage_to_the_underworld.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_off000056fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FE 5788 bytes
SHA-256: 35cd59f165c250b771e5f232de327dd970a95efd665568b897240892493b908f
font_01_sfnt_off00006a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A96 10588 bytes
SHA-256: 774fafcab338bcf4739fb72c34d7be8a67a5b181394a81630b430e292c3686b5

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