Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ba5a417f9018a1…

MALICIOUS

PDF

81.6 KB Created: 2021-04-03 08:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 85e086400587ee73268a3c23c53ef0e3 SHA-1: e1f86f5972aace3e3025cbefb196784290bde2dc SHA-256: 72ba5a417f9018a1597f9db08bfda80a91ecf57f73db199c3cc7cd810d064546
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=el+dador+libro+completo+pdf PDF link annotation
    • https://cdn.sqhk.co/puvegipuros/fjjciXs/ninja_village_kairosoft_mod_apk.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/how_to_expand_french_vocabulary.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/57975174608.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/user_authentication_mechanisms_in_network_security.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/waxud.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/wirorikine.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/bXhhohe/bapugoroluwevikuwoneb.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/shell_scripting_tutorial_tutorialspoint.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/68484629610.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/ramonujes.pdfIn PDF document text
    • http://zvezdasevera.online/kalotue7mi0.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/astronomy_worksheets_high_school.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/lojogabumopiwajatar.pdfIn PDF document text
    • http://lazadacostumercenter.com/what_is_the_best_free_radar_detector_appe0kxh.pdfIn PDF document text
    • http://cancandance.org/wu-tang_an_american_saga_season_1_episode_7_freecs0mo.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/catalogo_eudora_ciclo_9.pdfIn PDF document text
    • http://zoneeuro.pro/breakup_party_whatsapp_statusjptb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gozuketitara.onlinewebshop.net/tratado_de_direito_penal_cezar_roberto_bitencourt.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_a3f6e92961e74e3686ce936844bc9aad.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_ee34bea14d6e4ffd93c744c28747e394.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_59dbb7aae57c4b86af323cead8739348.pdf?index=trueIn PDF document text
    • http://xasejumav.onlinewebshop.net/amazing_grace_how_sweet_the_sound_chords.pdfIn PDF document text
    • http://pujumek.myartsonline.com/76665996018.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_727ff5ce4aad4c20b1b5d03c4879143d.pdf?index=trueIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_4922a682816a4d05b0651f1efd894636.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 4904 bytes
SHA-256: 46ad74eae6dc3942980695b9ec736ae8a816085c3dfda26c0930fe2b0a5d4fee
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 13212 bytes
SHA-256: 6145d17aae6875c968fcf331c5910ea22c1fbf3d0a497894b6ca7e6b36466de5
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333