Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d7f59fcbf39c36…

MALICIOUS

PDF

76.0 KB Created: 2021-02-13 20:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9dcd5d6f4c73ac220825115151364be1 SHA-1: 6a51c369ae369830848fa5eeecdeb32a485f24b1 SHA-256: 83d7f59fcbf39c3666583357fbf172670531e5c38eb3e0ef4302350f07b3e3a4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or social engineering scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=cocomelon%20nursery%20songs%20free PDF link annotation
    • https://cdn.sqhk.co/jidobimatu/SYBiifp/box_office_mojo_2019_yearly.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/hghaLof/monkey_shoulder_cocktail_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/CzOhehc/hotel_horizontes_playa_larga_cuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5fdd07686c5c9.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxobenona/gijggdH/assistant_project_manager_salary_san_francisco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_60089cd1af4d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5fedbf71072f7.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/iihj8ih/cnc_machine_for_home_use_metal.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/hEgjmDB/warhammer_quest_ios_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5feffc0377baf.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/klhiihc/arcade1up_nba_jam_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/WS6hAmM/55564134780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_6024a547c3f00.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/gJhc9tj/jigaduximaxotusinegux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizaxo/valod.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/wupudowekoxalinabojuguz.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/things_fall_apart_character_traits_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/phosphoesters_form_the_backbone_of_dna_molecules.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/37874623397.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/12103640111.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/free_whatsapp_latest_version_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/alludu_seenu_telugu_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/40545195800.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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 4996 bytes
SHA-256: c3f3d07c1903e45591a43ee470a4ee3cab524093f62441ed22420c37040988b2
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10644 bytes
SHA-256: f6453be7d2ab5b2c6796dccf718e31e314792981c20b0ab557214e8d2ed76f11

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