Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82018c0c4c16f72…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 21:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd99ae951db50db397dac3c5a7b55e14 SHA-1: 474d67a4cf2735605e8c3c5068bc30189460c668 SHA-256: e82018c0c4c16f7275592663cd8c645756cb92f39a982e5a6e6fa4ed8169847b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('mezovuduw.ru') and disguised with a search term related to technical manuals. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/123?utm_term=arrl+ham+radio+license+manual+technician PDF link annotation
    • http://zijafanovidiz.sportsontheweb.net/zonubemizumusotebaxiben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_60167badf0402.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/honda_eu3000is_generator_service_repair_shop_manual.pdfIn PDF document text
    • http://lusuwivaw.medianewsonline.com/pujexamomexipene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_600264b9ac3dd.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/bromazepam_6mg_bula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_604e264819965.pdfIn PDF document text
    • http://lafowesezojo.scienceontheweb.net/40371509134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421637/normal_5fe5d2bd58ebe.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/how_to_reset_aprilaire_wifi_thermostat.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/f561c314-3322-4246-b3c4-31816a7adf40/2832492599.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/mathematical_expectation_problems_with_solution.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/tim_grover_relentless_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4a451d-866c-47f7-9dbb-a26243ad7f1c/32135509850.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/suzevuparegikezawe.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/kibedukoxureguvebivam.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/william_shakespeare_shall_i_compare_thee_to_a_summers_day_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/compare_multiple_columns_in_two_excel_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e7df22-eeee-43f0-8c52-253e07fef63a/suxuvaxemisa.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/coway_ap-1512hh_price_history.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/vatodarowezuma.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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 5168 bytes
SHA-256: e7226bc1cdb77d75edbd678e4b1183f6262bd091bbd5010a2e44824ac7742bd0
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 11072 bytes
SHA-256: 786ec3b1728ca68ca18c6d9e73c3068e11fed339613a9f9803b5c40c69196988