Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b27ecd65650e7dd…

MALICIOUS

PDF

96.0 KB Created: 2021-02-27 02:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04bf04fe957d5ec09020716e699d9460 SHA-1: 592f6780bc567a9d265ce48eaf3a78e4ef10c937 SHA-256: 4b27ecd65650e7ddfd6b5b495016fb513af64bc8f5814074662c5a3669d29dbc
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('mezovuduw.ru') that is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/strik?utm_term=when+the+rabbit+howls+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407724/normal_600801f808f91.pdfIn PDF document text
    • http://idealicaitaly.site/free_eligibility_worker_exam_study_guide9vvrb.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/acer_aspire_e5-571_specifications.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5fcebd221e5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_6034879aedc6e.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/femoxikafukeme.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/88553901735.pdfIn PDF document text
    • http://affilateapp.online/how_to_connect_afterglow_controller_to_nintendo_switch0prte.pdfIn PDF document text
    • http://sexesex.site/incident_accident_investigation_report_formxf89j.pdfIn PDF document text
    • http://indohealth365.online/91423686810r0j3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_601304e90e038.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/fosawagodezuzawadokubaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/essential_clinical_anatomy_by_keith_moore.pdfIn PDF document text
    • http://wexejobi.rf.gd/ecological_importance_of_species_diversity.pdfIn PDF document text
    • http://zukuvib.rf.gd/64309498213.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/sutikikafenelogugexulekid.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/nemoped.pdfIn PDF document text
    • http://zuputes.atwebpages.com/81724454326.pdfIn PDF document text
    • http://zuputes.atwebpages.com/19534425817.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_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 5272 bytes
SHA-256: 1ea1213b9c7a92cb032021005cd4375f2f0e6ec7bc1deb464b8d8010b6f0efb7
font_01_sfnt_off00014bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD0 11508 bytes
SHA-256: 5d3f5ea91941c18d8572995359a4e4e65f63cc17bc7266f2e3dfe6c8b67c1c74

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