Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aed38a3dfc2398…

MALICIOUS

PDF

80.8 KB Created: 2021-03-30 02:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 12fe313f4c60aa0b1e82184bad2414d1 SHA-1: 21b4f731336e3f3cacc1370336ef5a6007c5e9a4 SHA-256: 17aed38a3dfc239862409baae39aa986bef4be8805a251617e9b92844d490381
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with a primary one pointing to 'kuzutuzo.ru', likely a lure for users seeking lab answer keys. The PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=percent+composition+lab+answer+key PDF link annotation
    • http://seweripuwas.mywebcommunity.org/web_graphic_design_tutorial.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/nilefufokoxejimijisaboxodohzs.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/2eJO746/amazon_gutschein_code_eingeben_wo.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/mamukevijidaja-rupetunebugara-fujit-vafuz.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ihifcgf/jopirelifiwobik.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/gefesudo.pdfIn PDF document text
    • https://luzafoku.weebly.com/uploads/1/3/0/8/130814295/kaxipag.pdfIn PDF document text
    • https://kefobisow.weebly.com/uploads/1/3/4/7/134733217/zurupagufiwisa_lajotimunurego.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/osaka_subway_map_2020.pdfIn PDF document text
    • http://daliadiago.com/90566917978rkubq.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/ibieDhp/strategy_and_tactics_world_war_2_sandbox.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/28365640170.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/pigamoneka-sezen-kipikijubo-panoxixegalota.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/Ajeice4/86703367045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/253c2da2-e602-4776-94e2-41efe64e1156/pisapa.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/cub_cadet_ltx_1045_deck_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/gigimin.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/australian_universities_list.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/lg_true_balance_washer_ue_code.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/debajisuvapowokosoxexeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa52cb5-a1ca-46b4-9954-35cc4119159a/how_to_remove_battery_from_troy_bilt_7000_watt_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/augmented_reality_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/belkin_n300_range_extender_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef068fe-a972-4e47-94c1-d085e66af266/racial_state_definition.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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 5476 bytes
SHA-256: 8fa0a214e1473b69f593f1883658bfacca7c96bfe5a7c59220a151a84a9f92f7
font_01_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 11912 bytes
SHA-256: 8110364fb6bd40a5bce4752bb97d5d16430cf7c87d579d8807c446ba675e7176

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