Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806c3a4f6224105…

MALICIOUS

PDF

68.3 KB Created: 2021-06-13 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4dd9a88a3ab14e9ad9ff4ba3a49a20ad SHA-1: e7277090ed639eea71adb7aa9328d1021342ca10 SHA-256: 9806c3a4f6224105ee9dde6bcc1abca1f27043f4e1a5ec1c7450f692fd1b9ff2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('kuzutuzo.ru') that is likely part of a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=htn+aha+guidelines+2017 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5ff5a971c8900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fec9f4fb82ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokuwulixit.pbworks.com/w/file/fetch/144612603/how_to_make_animations_on_google_slides_mobile.pdfIn PDF document text
    • http://sixuditar.pbworks.com/f/suma_de_3_fracciones_con_diferente_denominador_ejemplos.pdfIn PDF document text
    • http://lovizabodi.pbworks.com/f/50525608717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e6cce5-ed5d-4ba8-9506-7f50dd2a916f/2374752593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1016a4-7945-47dc-9880-92d407153751/nefolabup.pdfIn PDF document text
    • http://kenoxipej.pbworks.com/w/file/fetch/145084476/35520946503.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144603234/53338664813.pdfIn PDF document text
    • http://xopukuvolur.pbworks.com/f/empirical_formula_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29174e39-3c60-4211-a80d-65d4edd6ec40/cuanto_es_200_metros_cuadrados_en_centmetros_cuadrados.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144442896/download_game_ppsspp_naruto_impact_iso_highly_compressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86f8b57-b767-40f0-92b5-53fbe253b407/40152312571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bd15d3-278f-4466-9656-17b1e60257bc/blodgett_convection_oven_parts_manual.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144479973/which_of_the_following_are_examples_of_logical_fallacies.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_reset_tzumi_sound_mates_no_buttons.pdfIn PDF document text
    • http://busututesemo.pbworks.com/w/file/fetch/145183593/45141599496.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/145125264/15918669254.pdfIn PDF document text
    • http://buluwogot.pbworks.com/f/job_interview_weakness_examples.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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 5360 bytes
SHA-256: 409329e5b7ffc2486989e595fc49699868e7e182e2ca84e1870525f756b5c6be
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 10284 bytes
SHA-256: 8fef40f2990760ce931975728e0332b900f364b26c4bd6ebee82f1ec072e52ea

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