Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fac34ca17242b3f…

MALICIOUS

PDF

77.1 KB Created: 2021-06-14 07:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dfbfa85ad016829159d4c55e77e54ada SHA-1: 50b839f81052bc8fcab189d79250408c7f3d4de6 SHA-256: 2fac34ca17242b3f6f34277f8dbc1cb85e11f0385c4f568ce8680fa8fb2c1b61
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://cructi.ru/pbw?utm_term=teatv+download+for+pc', appearing to be a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document is part of a scheme to distribute malware or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/pbw?utm_term=teatv+download+for+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460950/normal_5ff3611763431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5ff4d21e7623b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_601d171a50a24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_6007285d2d0f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_605efafec8f72.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/5573f11f-0a77-48c0-bb14-cb5eee8cf99a/cuales_son_los_alimentos_que_son_ricos_en_purinas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722533a3-f397-4bb0-bc7f-dbec17e4a08c/zirapedanugepukasuge.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/bixedakaxorodebobuxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8703d028-fafa-41cf-8be3-43617e632191/what_is_typical_weight_loss_on_keto_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d344c4-d2cb-4f14-bd87-598a0edc9ae8/what_does_endorsements_mean_on_your_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fd3f14-0511-4e1c-89d5-dbff9c9ff243/what_does_825_mean_on_jewelry.pdfIn PDF document text
    • http://gorixose.pbworks.com/w/file/fetch/144616689/83089868437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c129621e-5f60-4303-a28a-bee4b50194bb/genie_pro_max_reset_button.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/hannah_arendt_livro_a_condio_humana.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144417780/dominos_number_of_locations.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/kms_host_key_office_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01d3ba8-a15a-419f-829c-d23222791c19/xigadopigebenuradefesej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65ef84f-3d13-4d33-9899-4ffa9ccfc802/contact_force_in_ls_dyna.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144614610/bosch_tassimo_coffee_machine_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e43bd40-d256-4817-ab5d-2208f55959ef/partituras_cantos_coro_lldm.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5072 bytes
SHA-256: 2e08923d8333e665e8b5011525ba9edaec77f240538a4b8e8376caaff7215fb6
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 11524 bytes
SHA-256: e598d139ed1bc59bff0e6b2a3d101c2edf333b14063101f5d2c4150b87ff8af2