Malicious PDF — malware analysis report

Static analysis result for SHA-256 6691b1b30eb0c825…

MALICIOUS

PDF

79.7 KB Created: 2021-05-23 03:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dc1b3d99e0f9cd6f51db72a77dc8bffb SHA-1: 572ac9fb96c9ddf787c0fb838f500ef5da2eebad SHA-256: 6691b1b30eb0c825a03832541268c28e157ad3e748cd9b6395b56dbd35821634
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with a primary focus on https://nipisod.ru/strik, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata related to 'real estate finance and investments', likely a lure to disguise the malicious redirection.

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://nipisod.ru/strik?utm_term=real+estate+finance+and+investments+risks+and+opportunities+ebook PDF link annotation
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/sajilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fe93fb3c27de.pdfIn PDF document text
    • https://sepikiduluwad.weebly.com/uploads/1/3/4/4/134487701/3352525.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/1038931.pdfIn PDF document text
    • https://jufapodoge.weebly.com/uploads/1/3/4/5/134582619/xetinufamesux.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/8568893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_602974363862f.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/7489217.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/rokopofepilizuz.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/1424752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5fdb5d32842e6.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/2ea3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487206/normal_6019da5932082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5fffb7b1f0228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/minecraft_pc_1._13._1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/how_to_reset_breville_coffee_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7801410d-2366-425e-b6c9-5ce59b49c873/what_would_jesus_eat_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/engineering_drawing_abbreviations_pcd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4776b74b-171c-4c42-af4c-fa785a5d7da1/how_do_you_edit_a_on_a_mac_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/student_information_system_sis_registration_bu_bhopal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38214db-555e-454f-a3c0-7494cdb674d4/eaton_endurant_transmission_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae0514a-a07e-4995-b9a4-421ce030ffa0/calcul_frquence_cardiaque_ecg.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/rixaros.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/aggregate_reports_in_pharmacovigilance.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_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 5572 bytes
SHA-256: b1039857e158987fef0dbcfa4083d25824bf393ca412541a7be083c4bb8abd04
font_01_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 10604 bytes
SHA-256: 5c15f0a8a16fe12d943768cbee509f8d64788b445311d09b09c8ed2467699de6