Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1af2e403daf17d…

MALICIOUS

PDF

73.1 KB Created: 2021-06-01 07:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b1deab2c54d10fbb14e5c135268ba1ce SHA-1: 28de7ae3873049b1c82c080dc61a32c01244a19e SHA-256: 1b1af2e403daf17d530e30a1985ae1bbd8c3d127fa733a8e30cd21f3923cdbf0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one notable URL being https://queure.ru/pbw?utm_term=hallelujah+piano+sheet+music+easy+free. The document's structure and the presence of many external links suggest it is designed to redirect users to potentially harmful content or for SEO manipulation purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://queure.ru/pbw?utm_term=hallelujah+piano+sheet+music+easy+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390638/normal_601b706a4f2a4.pdfIn PDF document text
    • https://nedebubet.weebly.com/uploads/1/3/4/8/134854500/rotuxex.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/154085.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/vabozobeduk_nutiwedogezik_mawokuva.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/zimakazij_pijodaniraxe_wigefoxajoxi_sazaninafakok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_600d336bb79b8.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/63945a99-ff01-4d07-a8a8-9d15999ef4c3/furujoluvagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd18b41-8858-4c6a-8e65-e24f55a5a397/what_is_ego_depletion_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397d943a-e156-4ea9-8c55-3aaf8c47e5cd/61726991988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377cf406-5ac5-4d59-88bc-fe3ed5a432e5/jozimiratakadit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0684b0-cddf-43e6-85f0-f9fd7c517c5f/jabupuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003d5596-676a-4b96-bde4-c39115209d75/los_amantes_del_circulo_polar_online_gratis.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/labokugexujoluki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f229e8-0917-45d3-9c46-0abbdd900824/84711530839.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/download_game_efootball_pes_2020_mod_apk_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9c15b2-3811-4c23-9f70-032fff17b389/can_i_use_baking_powder_without_flour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e311e31-4ee4-42bc-acab-da2607369425/pimelepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284d4026-9b32-4819-a01d-b4e0a284aede/dd_starter_set_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2303ec-4b19-417c-97d4-9ad86c5fff30/cazadores_de_sombras_ciudad_de_ceniza_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914d2c05-af8d-4acd-8367-d453bbd27182/wendys_nutrition_menu_calculator.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 5392 bytes
SHA-256: 6401c4d79296875b870619616d2f8b25118f44f677f4744cfe990c5c03e10e2b
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 10904 bytes
SHA-256: cb140b818fc29f737bfe6e2b4556cbee83594edc1f0d2d8911928e482b7358aa