Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f1fc0754047ad0…

MALICIOUS

PDF

75.7 KB Created: 2021-03-30 04:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef8be47e564bc8dd382e45b5ec6a29ba SHA-1: bb3a74ef1468368571fb1b107ef9a3b1c523cfc6 SHA-256: 21f1fc0754047ad0c02023998ac36c3589bcc773118919b588d1569f3ec7ba75
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Phishing.Trojan'. It contains an external URI pointing to a suspicious domain, 'botokaw.ru', which is likely used to host or redirect to malicious content. The PDF structure and embedded content suggest an attempt to exploit users through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/aws?utm_term=discourses+on+livy+machiavelli+pdf PDF link annotation
    • http://899themes-demo.ru/subject_and_predicate_worksheet_for_class_4gyxrg.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/agfabgj/draw_straight_lines_in_photoshop_ipad.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/criminal_case_files.pdfIn PDF document text
    • http://discout.online/esc_guidelines_valvular_heart_disease_2017_ppth1a9m.pdfIn PDF document text
    • http://nextauto02.ru/keystone_algebra_1_geometric_sequences_answers25ixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60317c9621207.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/el_cabala.pdfIn PDF document text
    • http://neo-tp.ru/how_to_adjust_a_poulan_chainsaw_carburetort6vyb.pdfIn PDF document text
    • https://cdn.sqhk.co/belerudoxej/Kb3OjaF/monkey_farm_animal_rescue_and_sanctuary.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/WO6KZ9G/babylist_registry_box_reviews.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_60612f14ae4bf.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/c320a99a-7f49-4acd-9f8a-b0484ce08bb4/2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff3ebe2-9006-4764-a06a-a17b7e5993bc/vexekofetajo.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/medical_insects_and_arachnids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475084f3-fddb-46d0-ab41-1d42987532f2/what_does_fastboot_mode_mean_on_rca_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec81c50c-fe67-4147-94e9-aa46323d301b/reading_comprehension_passages_with_questions_and_answers_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79695869-caaf-4c82-95c5-be8c54da3717/html_css_javascript_jobs_in_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4b9a1a-56ec-4b42-842d-5aeda9368807/fefupamom.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/62208837393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e8e290-7d3d-42a2-9d1f-bf3d62c16a19/ciclo_de_krebs_paso_a_paso_desde_cero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15632436-cbf4-4cf1-9fd3-5c252dd0c0ac/jomok.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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 5556 bytes
SHA-256: b0e1dc9ed11e38449b5859dc99bbfb85e185641048845103fdbafbb9fd5af80a
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10612 bytes
SHA-256: 155416bc5af9cbf2868422d2544f1764fced2f8bfcb26861ace1296cbeabbaf6