Malicious PDF — malware analysis report

Static analysis result for SHA-256 950291a8fa5a4b47…

MALICIOUS

PDF

70.1 KB Created: 2021-03-08 20:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 307c3ae250715ae5f976ec6d85bd1468 SHA-1: b8c641d916500e9103dafb03c5db224e4d416799 SHA-256: 950291a8fa5a4b47711208389b3f1a776568eed3f8a718d2677d0acbad429227
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious content under the guise of providing free PDF downloads. The primary malicious URL identified is 'https://seumenha.ru/award?keyword=advanced+calculus+pdf+free+download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=advanced+calculus+pdf+free+download
    • https://static.s123-cdn-static.com/uploads/4371267/normal_6007abe2611c9.pdf
    • https://cdn-cms.f-static.net/uploads/4414672/normal_6022a3ae0f241.pdf
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/susezafupuvataven.pdf
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5ffd1aa8a86c7.pdf
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60238010e0f44.pdf
    • https://ranedesipa.weebly.com/uploads/1/3/1/3/131398497/nokasagibareku.pdf
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6043275def1f3.pdf
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/pujezolororokoxo.pdf
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/36d7f3021e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takateg/ark_survival_evolved_steam_size.pdf
    • https://s3.amazonaws.com/pusixa/day_care_application_form.pdf
    • https://uploads.strikinglycdn.com/files/8a793cf4-3cd5-4be2-ac36-e6a3849f844b/46925318102.pdf
    • https://s3.amazonaws.com/pusolefosex/harry_potter_and_the_chamber_of_secrets_book_1st_edition.pdf
    • https://s3.amazonaws.com/rexogeguxosix/83649794666.pdf
    • https://s3.amazonaws.com/bezorito/wofepotelekaw.pdf
    • https://uploads.strikinglycdn.com/files/83283724-45b5-4460-8663-86834e92b5e8/gaxibuf.pdf
    • https://uploads.strikinglycdn.com/files/81e109d3-43cb-4b48-9403-791396a7baa0/whirlpool_conquest_refrigerator_parts_diagram.pdf
    • https://uploads.strikinglycdn.com/files/41eccfaf-fa26-4f16-ab21-b3fcc6fed7bf/how_does_the_firm_book_end.pdf
    • http://pujumek.myartsonline.com/76665996018.pdf
    • http://sajatuvireguta.atwebpages.com/vivigifivasipeneri.pdf
    • https://s3.amazonaws.com/farezelof/44241140537.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_off0000d665.bin
67eb9f90b0c934f3995ea42524088895039e2fc2d2f10530b3caf1d421e85e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 5292 bytes
font_01_sfnt_off0000e889.bin
93cfeb0dc6d23d97e380c41b7bab68ea603b15eac6817671dc8da6cc1f0b0cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 10120 bytes

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