Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b68dc28d9836057…

MALICIOUS

PDF

79.8 KB Created: 2021-05-08 22:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2edef2ac5b5e05bf0f747e1f2d4a64bf SHA-1: 7be9982e14c87de30d38d1707cac09e3198995dd SHA-256: 6b68dc28d9836057b40a72c7a6dc2307404c5ea6aca2bbb35e36854028819265
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic and ClamAV detection. The document body, though heavily obfuscated, appears to be a lure related to educational content, aiming to trick users into clicking the malicious URL. The presence of multiple disposable hosting links further supports a phishing or malware distribution 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=which+book+is+best+for+chemistry+class+12+cbse In PDF document text
    • http://zegiwire.sportsontheweb.net/36216521541.pdfIn PDF document text
    • http://avto-trokot.xyz/picsart_photo_studio_app_free_downloadyymd6.pdfIn PDF document text
    • http://rafale.store/junior_interior_design_jobs_chicago8s9pw.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/pesivetiwadukaf.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/chhattisgarhi_gana_full_dj_song1vz1h.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/cartography_definition.pdfIn PDF document text
    • http://garant-ritual.online/el_monje_que_vendio_su_ferrari_resumen_capitulo_7wkm0g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/is_kentucky_drivers_license_valid_for_air_travel.pdfIn PDF document text
    • http://sejineje.epizy.com/troy_bilt_super_bronco_tiller_engine_parts_diagram.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/fajagajezasorad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35790157-e463-4e8a-aa95-295b48199d22/ff6_llg_bestiary.pdfIn PDF document text
    • http://fabonejane.onlinewebshop.net/52868932394.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/how_to_create_dashboard_in_google_sheets.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/articulos_cientificos_de_biologia_marina.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/hayward_goldline_aqua_rite_salt_generator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/14187569584.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/acinetobacter_baumannii.pdfIn PDF document text
    • http://wuzugimekiwetad.epizy.com/vutepufebuxixikapo.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/dubigupefeni.pdfIn PDF document text
    • http://vonanovab.epizy.com/kapenimexalujomifonaremop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648e1492-5a2e-4964-bebf-7aef20a6b51f/koguraz.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_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 5624 bytes
SHA-256: 4f5364864156bcce33889bd1618802a6f04804ce09b114e5f48b61a49681dde7
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 10760 bytes
SHA-256: 6550ada70ef5aad588b5c532975afeab73e795a2b7730c3aedf0cdfa0bc280c7

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