Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f88d74372178598…

MALICIOUS

PDF

79.2 KB Created: 2021-06-14 01:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b1bc6b861862236e630c1acef03e17e1 SHA-1: e5a3893540d80cba60c12e4f0a89a7e0a79e324f SHA-256: 3f88d74372178598e37b35ffca15166821c66fc6f75a41d1cf581ee464f9b33d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nomylo.ru/pbw?utm_term=gta+vice+city+remastered+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6019bbfae4268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_606376d4ae232.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/litobuxerovuj-vazuleb-lipowe-taligewu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455179/normal_60affe2bb1ed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fc98f0fa6b72.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/4581360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_603bb2f2914b3.pdfIn PDF document text
    • https://pitinolulisam.weebly.com/uploads/1/3/1/3/131381612/pujux-gurigonapex-genile.pdfIn PDF document text
    • https://rizumamor.weebly.com/uploads/1/3/4/3/134395934/tedekusojitodu_wugif.pdfIn PDF document text
    • https://zigiruma.weebly.com/uploads/1/3/7/5/137517675/5705080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144996642/68303636622.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/fisco_agenda_2019_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfd47d0-eb11-41b0-b5db-5829d681260e/como_pasar_de_gramos_a_litros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4a32be-8841-4fb5-812e-11ce49c2ec9b/40338573131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5240de5-f228-4518-ae71-2de9a4a63e5d/internet_explorer_11_for_windows_7_ultimate_64_bit_full_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21234373-7b1d-4166-96b6-0d6071b20358/lg_washing_machine_engineer_near_me.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/18046796351.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144443862/wuxinonexoviwikosowejeriv.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/w/file/fetch/145077228/pijuxexiboxokidukomagas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa51d386-8dc8-448d-99a7-64aa9dd55b9b/ejemplos_de_dialogo_directo_e_indirecto.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144951570/intermediate_maths_1a_textbook_download.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/145270644/felisimezuzotowobona.pdfIn PDF document text
    • http://zixememot.pbworks.com/w/file/fetch/145033257/wojugixoxemuwolanud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9375612-0884-4757-9ea7-bd7adf665f7c/how_to_add_qi_charging_to_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95294880-3496-4979-ba70-fdd63334cf84/how_to_keep_slim_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1703e9-3b4d-414d-b84c-6d6624ba856f/61690264772.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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 5444 bytes
SHA-256: 2b60dd2ab7cb99ff8139c44dc49165f264c9179a5676adba840b614793d07647
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 11020 bytes
SHA-256: aea891bd7560c4d987087e5f299caf6e44b35072e6bdb3c8007222e486314093