Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de392f702b185f5…

MALICIOUS

PDF

87.3 KB Created: 2021-03-24 11:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52dd0c529d902f120b81e17a88567d77 SHA-1: e0612a14c6aadf19d0e67562a13168725fbb5136 SHA-256: 3de392f702b185f53a25a4fb377c045120a8d3906325adeb142be14e6e27112e
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=what+are+some+good+lab+safety+slogans+funny
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/8590494.pdf
    • http://sijubuwejipamun.mywebcommunity.org/calisthenics_diet_plan.pdf
    • http://uaregroup.com/gavoxuxexibubonunimikobqd5z.pdf
    • http://hotloveme.online/gonebizapabunpxgch.pdf
    • http://riwaxutitono.iblogger.org/basado_en_hechos_reales_libro.pdf
    • http://vonexalux.sportsontheweb.net/what_causes_a_dryer_to_run_but_not_heat.pdf
    • http://prechambre.xyz/wasitadamlrhpe.pdf
    • http://zibodotuf.mygamesonline.org/59518858531.pdf
    • http://luchdobro.site/best_pokemon_games_for_android_freedbpwp.pdf
    • http://yandex-dostav.ru/how_to_get_adopted_birth_certificateitg5c.pdf
    • http://takipibimaxubov.sportsontheweb.net/the_endocrine_system_consists_of_neurons.pdf
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/kogij.pdf
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/6515059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://webekilijonelew.epizy.com/descargar_netflix_para_android_7.pdf
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_9f90304869c24794b251f20eee71d819.pdf?index=true
    • https://s3.amazonaws.com/nilititonawafim/manualidades_con_cd_reciclados_para_nios.pdf
    • http://pigepitusedotet.rf.gd/poxigibovigisajetijaw.pdf
    • http://tisikifapov.rf.gd/alleluia_irlandais_partition.pdf
    • https://s3.amazonaws.com/difigomisosak/el_mundo_de_sofia_resumen_corto_por_capitulos.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_0db541443e104c9aaca7db70afb4ec75.pdf?index=true
    • https://s3.amazonaws.com/jujadodedaruxix/franois_charron_informatique.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_36b59c88465647a5a040ba060674d0a2.pdf?index=true
    • http://dovunufesesiz.onlinewebshop.net/samsung_dishwasher_dw80f600uts_parts_diagram.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_off00011469.bin
6ef89d9e0c157cae0297ecf10729e5161d8642ec80dc2caafeb550ccd97c0679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 5576 bytes
font_01_sfnt_off0001274a.bin
01bddabe8220f02bdc7231bb3d7f421a94fab998ae8d721ad130be37c02bec57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 11352 bytes

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