Malicious PDF — malware analysis report

Static analysis result for SHA-256 1012425f01f64f85…

MALICIOUS

PDF

42.8 KB Created: 2020-11-08 20:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a92a8bee206b52fe3c7a59a9356d39d SHA-1: 1ffca0bdf5ceb481b1725d95a73248158e46405c SHA-256: 1012425f01f64f85cf724617532015def748aa8b3389662b5dd8369234158b9e
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to other PDF files, suggesting a link farm for SEO manipulation. One of the embedded URLs, https://traffking.ru/123?keyword=quarrel+between+achilles+and+agamemnon, is likely malicious. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment.

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=quarrel+between+achilles+and+agamemnon
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/152948.pdf
    • https://cdn-cms.f-static.net/uploads/4459060/normal_5fa37adca1c70.pdf
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/vujoki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a4e7674-14ed-4de5-9abf-fb8a10e9548b/district_60_pueblo_schools.pdf
    • https://uploads.strikinglycdn.com/files/b5ef7ff5-142d-445a-8f6b-7bbf2e35d432/katajeke.pdf
    • https://uploads.strikinglycdn.com/files/9b45636f-6db0-410d-a47d-13449b02345d/45833502298.pdf
    • https://jasobegofur.files.wordpress.com/2020/11/vibijapulorix.pdf
    • https://uploads.strikinglycdn.com/files/095ff68e-5ddc-43f1-be72-0fe498583b6a/cellulite_treatment_machine.pdf
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdf
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdf
    • https://fugafina938553339.files.wordpress.com/2020/11/bolekunekokapul.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000665d.bin
7970a187dc19ec57f201d882637672ed3ac147de54dc52d893bf8d82f1d2767c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665D 5644 bytes
font_01_sfnt_off00007971.bin
68cf4899c0a8b0702de4d7c8b1713a62044a948a0b0fed056cc37585b63e8239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7971 10848 bytes

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