Malicious PDF — malware analysis report

Static analysis result for SHA-256 74213c86ab98593a…

MALICIOUS

PDF

78.1 KB Created: 2021-04-04 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 35a17fd2734d8200cec5786abda4c67a SHA-1: 471e4119b897a68ff597dd73bd2cb889b172a5ae SHA-256: 74213c86ab98593aaa708b5e90c935b6a7fc469a4052508e2076b8cb6f74418d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/123?utm_term=cbt+worksheet+for+anger PDF link annotation
    • https://cdn.sqhk.co/nupegefozub/qUYijfg/recette_sandwich_avocat_vegetarien.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/ijdlb94/fowivukupunafenoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/ndhf11c/36345633690.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/f1jfsYR/57146290402.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/qwij5jc/best_sandwich_bread_recipe_without_yeast.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/bZhfha8/full_screen_whatsapp_status_video_download_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/jbJgfUD/rovedomizabadow.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/lhfiGkf/bible_word_search_puzzles_for_youth.pdfIn PDF document text
    • https://cdn.sqhk.co/widobixi/jchiigU/75448173573.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/ijdBpjb/zero_city_zombie_games_shelter_base_survival.pdfIn PDF document text
    • http://fekijijiz.iblogger.org/python_data_structure_and_algorithms_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/1gcgfvL/among_us_wallpaper_1000_dope_wallpapers.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/vertical_analysis_balance_sheet_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujelinenifa.rf.gd/35245905581.pdfIn PDF document text
    • http://lesuketel.rf.gd/65700068513.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/what_is_the_main_role_that_oxygen_plays_in_cellular_respiration.pdfIn PDF document text
    • http://suwulinivez.rf.gd/rujakemamajime.pdfIn PDF document text
    • http://xososalubebejen.rf.gd/affairscloud_weekly_april_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/guardian_university_guide_2019_computer_science.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_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 5200 bytes
SHA-256: b2a4a0806f82de3f51007d77d9a64486089d0b73e50d19fa6d065a1b0070c18d
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 10952 bytes
SHA-256: 8ce6ff4066259934c3b0ff4fbd2867764e7b32126441c3ca1d67ac15d8c10d80

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