Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b878c30766cca69…

MALICIOUS

PDF

74.6 KB Created: 2021-06-05 15:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2fb6bef2c97f6706dff617a6644cf1b1 SHA-1: e5ffcaf2faa8314c3c5b28a33cc7bef4b9094190 SHA-256: 8b878c30766cca69e7be60ce79162cfc1bbce5821957189eae93599f8a17a49c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware delivery attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. The embedded URL 'https://crysiq.ru/pbw?utm_term=arris+modem+ds+flashing+orange' is a key indicator of the malicious infrastructure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/pbw?utm_term=arris+modem+ds+flashing+orange PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd242a60-8ba1-46f8-835c-c7b80153fd1a/dokoxorolilosuk.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144528891/16468823710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeaa55f0-4e96-4c94-981f-f633809cedf1/44948410939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3855c858-5fd3-45f0-b307-2b7d3a6aed23/does_bose_quietcomfort_15_have_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61df1113-2fe9-4f62-b23c-c004fcae0e8a/reloparev.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/how_to_do_negative_exponents_on_a_ti-30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950ee5fd-01ea-4eaf-9615-4bfaa05f446d/jubimivexubavegekalaf.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/how_many_red_ace.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/85103013344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390e0aa3-94e7-4ec6-8dfe-2b00e4ff63ed/solucionario_dinamica_hibbeler_12_edicion_capitulo_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0aff50-e7e0-422f-a43a-08e08fbbbfc5/how_to_edit_video_on_iphone_7_imovie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cee5fd-2d67-46d1-a650-5aaa1920479a/pitetotunedovi.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/how_to_reset_error_code_on_rinnai_tankless_water_heater.pdfIn PDF document text
    • http://finebov.pbworks.com/f/73016549100.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144573378/50344347828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b812a7-5d1f-4304-baec-4333481d0c12/free_backing_tracks_for_tenor_saxophone.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/w/file/fetch/144633132/poromopififedonik.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 5308 bytes
SHA-256: 4b1d8b8709671d33917b1d2186a89f40094e516aaec61fc16120b1008c0f9c90
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 11212 bytes
SHA-256: 2af87e6d2517d35b7fda9c55a194bd7b74410c33aceb5d203f08f497afca5d7e

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