Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d6584395ab09b3…

MALICIOUS

PDF

44.0 KB Created: 2020-11-07 10:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cf753a4a706dfbf2ffe1f86c4422b613 SHA-1: b37c068659041442192b846783679d6174a09aca SHA-256: c3d6584395ab09b3ff4e223f057e46bb303a61e174f37a2cc3ca691a4a046f07
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://traffking.ru/123?keyword=ap+physics+b+released+exams', is embedded within the document body and appears to be the main lure. The ML classifier strongly indicates maliciousness, suggesting the document's purpose is to drive traffic to potentially malicious or SEO-manipulated 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://traffking.ru/123?keyword=ap+physics+b+released+exams PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8757fdc3921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_5fa39976113b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_5fa4d0e49ac79.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/dbc3f.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/nababenusulu_divedanaxade_zakivupi_bozipafa.pdfIn PDF document text
    • https://vupikesuxal.weebly.com/uploads/1/3/4/3/134397623/4792053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5b7369-ed7f-4dfb-a6c9-345ff8a27486/xizeboruxigep.pdfIn PDF document text
    • https://xoxedoxiki.files.wordpress.com/2020/11/garibipaselum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35f6529-4f21-4b68-9bfe-e70166bb09e6/regents_earth_science_doppler_effect_and_redshift_worksheet_answer_key.pdfIn PDF document text
    • https://malopotobi.files.wordpress.com/2020/11/bubiledewadutagofamujaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f091643-2d26-4837-88d4-bced97615b40/35260354471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0202274e-b430-4c3d-95a6-ad7ddebb680c/58383172796.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_off000062b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5612 bytes
SHA-256: 39bba5a5e529e74032abc93c045065e2f52a72aeec10af4951df9e73ec2a25da
font_01_sfnt_off000075a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 12952 bytes
SHA-256: 02870b376fef2536dc28afb5ed6ad637067c4e5acef2910ae8ed350b0b2ebb3a

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