Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ac888d0b828937…

MALICIOUS

PDF

73.5 KB Created: 2021-03-07 21:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d0812fb635fd04cdfff0beb496fc15b SHA-1: 2b5e46b1d74d3316adef6f50ec9c132df353824d SHA-256: a3ac888d0b828937712537814dd5d6e6fc8240ec183e5caec0fcdcdbdeb2703f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to contain search-like keywords, indicating a lure to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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/wix?keyword=conceptual+physics+textbook+chapter+34+pdf PDF link annotation
    • http://sokixatov.mywebcommunity.org/how_to_start_trading_online_for_beginners_in_india.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/burnham_boiler_parts_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_5fdc3a15ad792.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/gezopemovorobe.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_get_rich_felix_dennis_po_polsku.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/how_do_i_update_my_mcs-150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fe5db0c15051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_601968e2b2b33.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/x1_dvr_box_dimensions.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/sunbeam_heated_throw_problems.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/starcraft_2_units_counters.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/19731147335.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/how_do_you_clean_a_hoover_steam_vac_spin_scrub.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/wezodawetewobum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_600a98f312250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kojenixerog.myartsonline.com/examples_of_compound_complex_sentences_in_to_kill_a_mockingbird.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_to_play_harlequins_kill_team.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/comparative_and_superlative_short_adjectives_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70a1b6e-7ea7-4c3d-8aad-bb54be6ecdfc/how_to_connect_my_honeywell_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68891cc4-6513-411e-824f-c60f5b660d70/75044817715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9e16da-eb6e-40a1-8ad7-bff1d32b313e/56772764340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6838ed3-4f28-4580-b39f-d05669315f34/41209073158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0247db-8142-4de0-b105-a039eaf689f0/what_are_the_theories_of_vocational_career_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba53e4e7-1929-4823-9349-4d342bc5b84e/how_long_do_you_cook_a_half_ham_in_the_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff844e4-a85c-4791-8f08-ed7887cd968e/ultegra_di2_groupset_disc_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f905c6-cb60-40bd-ada4-941be53105a0/a_first_look_at_communication_theory_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 5776 bytes
SHA-256: 6eeb629eef4e22026bfa42ce02d00e5e6ce7ac90a3bd31dcdce0cec98f28c61b
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 10104 bytes
SHA-256: 501c3fb6683ff7cfed08fa1c7eeeb71a5d4e027bc70cb6b0c3c0012e436ab12f
font_02_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3