Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d016834e09442ba…

MALICIOUS

PDF

68.8 KB Created: 2021-03-01 09:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6d164ce27f174974065660723e18849 SHA-1: 671555372eb214804332d008db9c7bb0f453155f SHA-256: 5d016834e09442baff8aa1a673a632cbe47b822dcd4af62fc521da9207a46e95
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to lead users to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/wb?keyword=macmillan%20mcgraw%20hill%20math%20kindergarten PDF link annotation
    • http://pawezujexas.mywebcommunity.org/what_type_of_exercise_is_best_for_parkinsons.pdfIn PDF document text
    • http://triple-doska6.club/minecraft_damage_soundlpn61.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/76335812775.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/what_is_the_color_order_of_belts_in_karate.pdfIn PDF document text
    • http://b4shop.icu/the_highwayman_over_the_garden_wall_chordsbsqqf.pdfIn PDF document text
    • http://flash-sar.online/asking_questions_about_cultural_anthropology_2nd_edition_ebook97uvu.pdfIn PDF document text
    • http://walkover.me/how_to_become_an_animator_at_homejdcgg.pdfIn PDF document text
    • http://jushq.club/editable_car_loan_agreement_template06g22.pdfIn PDF document text
    • http://opt05.ru/91121207967p3izj.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/61955820460.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/33351872578.pdfIn PDF document text
    • http://bridgecommerce.com/83772911132vrwn7.pdfIn PDF document text
    • http://marketes.pro/gukupirjrpi.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/gidibesuxi/ashampoo_winoptimizer_free_1._0._0.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/1993_toyota_pickup_frame_repair_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/follow_your_heart_vegenaise_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/tor_onion_browser_mac.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_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 5336 bytes
SHA-256: 8b7ce63e55f30c07fff57695b1104f8755ca4bf11c36f4f025e09ac49f956023
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 10692 bytes
SHA-256: 94d48c185bc7a3cff768a37909a398c0bbfa5b3a2738f7a17bf304c2795f4ead

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