Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed728471c033e552…

MALICIOUS

PDF

73.1 KB Created: 2021-03-20 06:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b441644fc23827b7b13eee0fa88ccb SHA-1: 26ef7c44637e7ca2280b9bb2067ca5018ec8ff60 SHA-256: ed728471c033e552583e7a4a4d953487c901d9d6e17d0e4b3deec9bb802681c9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, with several pointing to unknown or potentially malicious domains like 'kuzutuzo.ru' and 'boomua.site'. The presence of these links suggests an attempt to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=triangle+inequality+theorem+worksheet+math+aids
    • http://boomua.site/know_it_or_blow_it_trivia_gameuhtj3.pdf
    • http://xebubux.sportsontheweb.net/mejeragoge.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5fdb2b61a392a.pdf
    • http://bachanalytics.com/short_response_paper_exampleqv37t.pdf
    • https://cdn-cms.f-static.net/uploads/4394079/normal_60483dd4eda56.pdf
    • http://xitabijasava.getenjoyment.net/tagivo.pdf
    • https://cdn.sqhk.co/kivuwutu/dgdghnz/cuisinart_frozen_yogurt_ice_cream_maker_directions.pdf
    • https://cdn.sqhk.co/serodozire/icbhChd/avatar_maker_app.pdf
    • https://cdn.sqhk.co/kifavubivelo/haG3279/39048501254.pdf
    • http://igcopyrightverify.com/design_of_mechanical_systems_bookmkf70.pdf
    • http://ch-redirect.icu/how_to_clean_filter_on_ge_air_conditioner7en7o.pdf
    • http://uablog.site/english_songs_websiteea4v7.pdf
    • https://cdn.sqhk.co/bezakebijuk/Wjbmjjd/color_block_puzzle.pdf
    • http://losmopaka.site/apply_b_form_nadracxrbk.pdf
    • http://familyit.info/gilunazuposigujurejaxxdl6p.pdf
    • http://agentsecure.space/birthday_table_decoration_ideas_for_baby_boyroqac.pdf
    • https://cdn.sqhk.co/wirubetena/geiiep5/classic_chess_games_free_download.pdf
    • http://shoplus.info/29490261741rbtgx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/23f9169e-f96b-4a7f-baab-b8399656de11/how_to_open_bunker_hill_safe_without_key.pdf
    • http://gufopexolax.myartsonline.com/pakofiro.pdf
    • https://uploads.strikinglycdn.com/files/6c089458-9814-4e77-83b5-eb4c9c6face8/open_paint_in_word.pdf
    • https://uploads.strikinglycdn.com/files/85e0f7a8-afa0-41df-ae8a-93d7e2f8d94b/continuidad_de_los_parques_resumen.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_off0000df5a.bin
c71165fa031e8777f4afac3e7e7587614961cc50bcf45eaae898eede45bdd454		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5572 bytes
font_01_sfnt_off0000f229.bin
64c7f60be9797d369d8f06f408106c46c0655c24ce2711dd249b3d5c7083932a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10656 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.