Malicious PDF — malware analysis report

Static analysis result for SHA-256 a871fa2ac3130f66…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 23:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42917dd7e246384a142275aabe6a4bd6 SHA-1: b319585fde72ba5c32e3e897616c2ea8ffe3868e SHA-256: a871fa2ac3130f66228136acf9a23883605b316565b2221c83f2d29e3d7757be
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, including the primary malicious URL 'https://kuzutuzo.ru/wix?keyword=vandalia+court+records', indicates a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to malicious content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=vandalia+court+records
    • https://cdn.sqhk.co/dogilijesiwu/avzAKmx/weekend_edition_sunday_september_13_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fe3b9246c8d3.pdf
    • https://cdn.sqhk.co/kufiremikaf/qiaifhb/metal_shooter_super_soldiers_mod_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc8b758e55a5.pdf
    • https://cdn.sqhk.co/wuluzajiroz/ghkG1pI/magazine_layout_templates_for_word.pdf
    • https://cdn.sqhk.co/baveninale/hjjf9gf/dfinition_cahier_de_charge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/457b49da-7ad9-4dea-80c0-a11db212955c/full_motion_tv_wall_mount_walmart_instructions.pdf
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_987af12118ea4344acf11c4e7a6e1496.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_101c4d4ba92044e184752f54d30cefdb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82792b2a-dfe2-4c58-a5e3-11591f79273a/32627813495.pdf
    • http://rupedixinej.rf.gd/90239766746.pdf
    • http://worutigije.epizy.com/marquette_welder_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/e7171f56-aa49-4384-bb09-fe44c3b209b0/kutupax.pdf
    • https://uploads.strikinglycdn.com/files/904e98b4-4b24-480b-84ba-ebb852b78fca/how_to_reset_lexmark_printer.pdf
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_672158d468ca43c2907ff0b8be5cc5dd.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_1c3a3048487f4717874191781b9c3115.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03a54a79-da1c-466c-8f13-508b7638e1b0/how_to_handwrite_on_on_mac.pdf
    • https://uploads.strikinglycdn.com/files/3c436077-6ed1-4b88-a08e-ca6340cbe39e/stephen_king_book_covers_puzzle.pdf
    • https://uploads.strikinglycdn.com/files/7e05df28-f684-46bf-b26c-1409ca6ac3ad/what_are_idioms_and_examples.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_off0000ed33.bin
45f2e089a53ab0f6f4977cec8bc6bdbd2da23c940ce1e256ded7bf53c856b622		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 4900 bytes
font_01_sfnt_off0000fde9.bin
1819ef7180775be4a52162fd717a95c7f94ca443b674e9d5f377af3a21fa18bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 11100 bytes

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