Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9e7e2c632aa02c…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 04:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da95d64094f79422cd3e40553976bb16 SHA-1: df561cdeb6ef4240919cdb03230bf200b3304d81 SHA-256: 9b9e7e2c632aa02ce8c0faa0065033a52677cd1228b2d58799459ad44427b6f5
156 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 0.9991

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 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.
  • 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://bologen.ru/wix?keyword=realidades+2+capitulo+1b+answers PDF link annotation
    • https://ranedesipa.weebly.com/uploads/1/3/1/3/131398497/773a4d1abb.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/1d9b33266.pdfIn PDF document text
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/jukipuvag-fesibanog-bigikaxigeri.pdfIn PDF document text
    • http://giocodigital.website/fisijosebaxurusofonijikixue095.pdfIn PDF document text
    • http://hangookoil.ru/how_does_a_series_llc_workgh8gs.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/foneniz/zibuzatobekafideganu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0532350-5911-4f04-98af-789fcc137ce1/the_norton_introduction_to_literature_12th_edition_online_free.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_b1f9fac35ed849a599e7673bce836316.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/bootstrap_admin_template_themeforest.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/36196906564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231cbd5a-aea4-45c7-8fde-5f26c82105e2/21413880141.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/lusidajekawesagul.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_ea177520589142cfbf5a2049997f67de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/nj_drivers_license_permit_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5473f740-68ca-478d-8225-c07d50aa597e/medios_de_comunicacion_actuales_y_sus_caracteristicas.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/wpf_binding_string_format_integer.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/58926734238.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/63170394807.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/maryland_crabbing_report_2019.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_f5237ab6a9274c1f9961f2ebda7bb420.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5937fdcc-250c-44cd-bcb3-aa552b45a6f8/nedisakesavexe.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/bolufedevodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f38e4b-6506-4e2d-ade9-6fd9be8e88c8/gaggia_titanium_for_sale_uk.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_fa60a94140334632acb0863703da3c8f.pdf?index=trueIn 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_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5488 bytes
SHA-256: 2d6b65d13aaa13e0e7fd4007f0f7a96785e6dbf7cde2d19734833099a5adfec6
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 11140 bytes
SHA-256: 2f694435678eeba0565e67e7dea15d1005b9f9568b37ee563482aa7036cbd1d5