Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b6efde076b1e96…

MALICIOUS

PDF

71.3 KB Created: 2021-03-04 08:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8d8ee82c8857086b430f342419b91b35 SHA-1: 5e4ede3d36af228a1dff288cbf70144ea98bed76 SHA-256: e1b6efde076b1e965d3c9afdd81ce2dc19d88524354e8e1853995b623430a9d5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'electric power worksheet answer key', aiming to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=electric+power+worksheet+answer+key PDF link annotation
    • http://sallles.ru/asma_ul_husna_malayalam_meaning61dlt.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/what_is_the_best_way_to_store_iceberg_lettuce.pdfIn PDF document text
    • http://konsalting.info/linksys_ea2700_default_ip_addressjhvwk.pdfIn PDF document text
    • http://ketosimple.online/10917422347mittc.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/normas_568a_y_568bmt393.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/electrical_engineering_technology_salary_nyc.pdfIn PDF document text
    • http://getsol.xyz/honda_eu2000i_oil_change_intervaldhjwo.pdfIn PDF document text
    • http://avit0.cc/bass_music_player_onlinewaumk.pdfIn PDF document text
    • http://meinekarten.best/american_history_x_full_movie_redditp3eie.pdfIn PDF document text
    • http://skidki-day.shop/94520939638pfbme.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/93685925732.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/d9giLej/shogun_assassin_movie_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/hdiesSL/running_fred_game_download_for_pc.pdfIn PDF document text
    • http://stalekost.site/23192001097hzj9u.pdfIn PDF document text
    • http://mmmuuuue.space/introduction_to_the_design_and_analysis_of_algorithms_3rd_edition_solutions_manualwcibg.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/rGZYygd/46023259968.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/YpgelXw/tonur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexolofifete.atwebpages.com/optimate_4_tm_350_dual_can-bus_edition_para_bmw.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 5236 bytes
SHA-256: cf8ad239a88e64aa46affd22b9764648799448eaa5624b98c6d86809e30b6083
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 10076 bytes
SHA-256: cbc2c5830e32909530e6a50183930f7310b0d0b495aba79d4545a09710663c2b

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