Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c07240d15c5753f…

MALICIOUS

PDF

92.5 KB Created: 2021-05-09 22:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 673d087547a7a67de24bf1e9032d2512 SHA-1: 2ed60b6afd8bc1f813ec7436205b9062884af7a2 SHA-256: 5c07240d15c5753fb0aee0c21cbe203f2d0d0db6d38d703d9be48208a7971c9e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, appears to be related to the lure of using OneNote on an iPad, directing users to this malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://kuzutuzo.ru/strik?utm_term=how+do+i+use+onenote+on+my+ipad PDF link annotation
    • https://cdn.sqhk.co/jurufovowufu/hgdUifU/roperonazigepem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_6067342daa3b6.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/el_aleph_luis_borges.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/22585089631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_601512c946dfb.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/gegg2X6/splashway_sheridan_rv_park.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/woxuwojujasilivixik.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jcjjgim/karuvefozelegokizuze.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/54049551807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_603400d1daf16.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/17691639871.pdfIn PDF document text
    • http://kinerexasuxemo.getenjoyment.net/jirev.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/23158816-9aaa-4306-8a88-b174b3e61e2d/is_pokemon_go_still_a_thing_2020.pdfIn PDF document text
    • http://lewomunenuvi.myartsonline.com/simple_pathophysiology_of_stroke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7355ccdb-34e7-4ce3-aa2a-433fd961602e/nuxowujagateduzod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843774d5-088d-4fd8-8a66-b0f752322f07/58123920985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6475b8fa-efb3-48bf-a319-a7048443b415/power_function_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896c0946-bc3e-4a78-b2df-7699ad89b4f2/what_my_first_grader_needs_to_know.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9842f199-8423-43d8-92b4-22ccac7a2ec2/bluedio_hurricane_headphones_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920915bc-8559-4831-aaf9-8611fc8638f7/20_ml_a_cuantos_gramos_equivale.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 5132 bytes
SHA-256: f2770a244bfea0977c66f35af3020e084cac7a1435acd2b2f0c7f35a9651719d
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 10756 bytes
SHA-256: a6bd8b053bd59275f3db5a316c68b9a05a74f8edea39367380accd6bd212a3f3
font_03_sfnt_off00014f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F16 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b