Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37873f8527bd8dc…

MALICIOUS

PDF

82.9 KB Created: 2021-06-05 18:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3e1317f7cd5590bfe408847028507bc SHA-1: 9a358f4136f3b1f938f78b94ec599f56c06167d8 SHA-256: d37873f8527bd8dc580cd575463e40848e28248c01d5f74f43e348bfdb9203d1
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9998

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://gimoguvi.ru/123?utm_term=android+chrome+new+tab+page PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144443379/how_to_descale_a_tim_hortons_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c92ead-f7a7-474a-bc15-3b36ba5f220b/jivatawilisosunoxezub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d1fb24-f7df-4e47-8c71-ac8a3e7d7d7f/9151844976.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144573189/the_mummy_returns_full_movie_download_in_hindi_dubbed_480p.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/w/file/fetch/144427497/koreledaxokejafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f35cf3f-3edf-44e7-9a7a-55625009c7ea/fios_wifi_6_router_yellow_light.pdfIn PDF document text
    • http://buxozobodu.pbworks.com/f/race_car_design_derek_seward_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f99a18-f857-49a0-8ee2-a6cd0d34825c/56016117849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a600679-28bf-4698-b131-936180dfe5bc/19257585823.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419772/les_alphas_livre_du_maitre.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144534138/b1_b2_grammar_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e80af47-39e3-4d42-8b9a-c9c0ee730355/dc_harris_quantitative_chemical_analysis_9th_edition.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144635184/60775843538.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144481068/gazesaketasekaduporag.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/how_to_delete_joy_launcher_alcatel.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144625440/17993899150.pdfIn PDF document text
    • http://pejuzor.pbworks.com/w/file/fetch/144552654/35555169288.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144417756/how_to_know_what_size_your_gucci_belt_is.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 5500 bytes
SHA-256: 9d6b4dc1cc1ef3c433eefcd4cc8763545a2f41e790eaccc8287a4ad84af68362
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 1936 bytes
SHA-256: 7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 11584 bytes
SHA-256: 09907cc8ce2eb57cefc6b633b037cc53eae717e5506be8c04d447c6346fb54f4

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