Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0af42192500bf0…

MALICIOUS

PDF

75.1 KB Created: 2021-03-30 18:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 3341aaef0fcaeecb2fda971ca6fb9327 SHA-1: 93c8a47f43d524bdf06c4e7e8f4b4e254dd527b7 SHA-256: 4f0af42192500bf0f98217e1ca195999f17a139969bf178e7804fbd179ba503f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO spam operation. The primary external URL, https://seumenha.ru/award?keyword=importance+of+conducive+learning+environment+pdf, is likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=importance+of+conducive+learning+environment+pdf PDF link annotation
    • https://niparazuxadema.weebly.com/uploads/1/3/4/0/134040736/cbdb14ccfa.pdfIn PDF document text
    • https://sebexuvifezurob.weebly.com/uploads/1/3/4/8/134881690/mifutivumasubu_xozogabozakobes_gavutexufa.pdfIn PDF document text
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/guvekawo.pdfIn PDF document text
    • https://pusugokejetajek.weebly.com/uploads/1/3/4/7/134765622/adcc90a10098.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/4042625.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/limopixisedebuju.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/3bbfedd79aa0df1.pdfIn PDF document text
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/nagizazobufejub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6048a2375915e.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/2173944.pdfIn PDF document text
    • https://xudezilo.weebly.com/uploads/1/3/0/7/130739240/16ef69f1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_602f0c57a30b1.pdfIn PDF document text
    • https://werijininen.weebly.com/uploads/1/3/4/6/134635560/togibadew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_605c743d96a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470843/normal_604374e03a744.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/a86becc47f6f1.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/ketolawezu.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/7b047660-2e54-415a-8c64-80f53d48d4e3/xosezevoxakobifuwowikagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454d8dd0-010b-4cbd-b9fb-73b424c190f7/how_to_factory_reset_palo_alto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a406e7e-9283-4fa5-8f00-013660fb8afe/cuisinart_dlc-7e_work_bowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2761bd9b-e3aa-48ab-bf0d-0a135dbe0412/how_to_tell_if_first_alert_carbon_monoxide_detector_is_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25861758-3c22-40a9-9b6a-d9def19fba10/jalirinimamuwabok.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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 5296 bytes
SHA-256: 3c8be82a28aafaf976fb5d46484daf49939002a75ddb9f9cee83d611f5c9a972
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10808 bytes
SHA-256: 7a0816bfb6ddb7928768770e927f94a8d365f3d6ee07b294faa802de02f984ff