Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc00c5e938078cc6…

MALICIOUS

PDF

92.9 KB Created: 2021-03-18 17:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 469ffdd6d06f341a17733efaa750d4b8 SHA-1: e5f4cdd3f709189b9860387ef24f87a591d34218 SHA-256: bc00c5e938078cc6ef43f067d4572cbb662fb9a22a7df969ae7aae6e38beb5d4
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://crophysi.ru/wix?keyword=irs+schedule+e+2020, is flagged as a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'IRS schedule e 2020', suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=irs+schedule+e+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_60404c7d3ac37.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/mechanics_and_thermodynamics_of_propulsion_2nd_edition_solution_manual.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/71135566055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_600d674a91473.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/31705639007.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/bass_pod_xt_live_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_600d6d2c2f97a.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/gugasesug.pdfIn PDF document text
    • http://timinome.getenjoyment.net/how_to_prepare_top_bar_hive_for_winter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602143f3bea8c.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/922df7f2-23fc-4de5-9df4-ea9f5572a444/fotos_del_sistema_endocrino_y_sus_partes.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/atalasoft_print.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/commodore_64_computer_compendium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a41d01-cd16-4aee-af80-c741f70cb621/oral_b_pro_5000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52b4013-4e84-42c0-beb4-40d46129eaf2/panunojurobofawusaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597060ae-bd0b-43fa-b7e5-d518c5f89ebc/91320444109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316590a4-52d8-4a39-9f4a-62e8b871ec2c/wulaxuradunasekota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42181cf-ebe6-4ad9-8338-b78a2247d076/viwatepunedezakowipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec9534a-aba9-4a92-bc33-d64318749acc/erik_erikson_stages_of_development_quiz.pdfIn PDF document text
    • http://bazusokilole.rf.gd/17706840365.pdfIn PDF document text
    • http://pixafur.atwebpages.com/online_student_attendance_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7870c07f-ab15-45e0-ae19-39f71fe7f07f/32431409293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c524467-bcef-49d7-b892-9d9732acc942/45125663220.pdfIn PDF document text
    • http://jopubijako.atwebpages.com/bazabosegu.pdfIn PDF document text
    • http://gepuwuvezu.epizy.com/bodybuilder_hd_images_wallpaper.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 5028 bytes
SHA-256: 4c32a6df650fe14e9d3975af233d7154149807a61b2427567aaa01401263ac34
font_01_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 12040 bytes
SHA-256: 487feec473433c39a78f28d7abc30f0f67d41c36c79057d9f848819d9bc340fc
font_02_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 16104 bytes
SHA-256: 712590c835452c60cf4005d5ff3b4291b7bdb94b5c22500be4ce3d5353b46ed1