Malicious PDF — malware analysis report

Static analysis result for SHA-256 e428d36f567c1cea…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 19:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cb89ce9bcd8220dfe78a0200913300e5 SHA-1: 5212657407e10bf26794c233750452e2f1741393 SHA-256: e428d36f567c1cea792793c6e84432d47d68bc3fcc02309448e30e2202a452b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/award?keyword=pearson+physical+science+textbook+pdf PDF link annotation
    • http://mebelrostov.ru/the_witcher_books_set_nzdq4rt.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/what_is_the_standard_enthalpy_change_of_combustion_of_al2s3.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/administracion_de_pequeas_empresas_anzola.pdfIn PDF document text
    • http://nirenodeba.medianewsonline.com/wazewaxev.pdfIn PDF document text
    • http://vykupavto54.ru/serway_physics_for_scientists_and_engineers_8th_edition_slader0du2o.pdfIn PDF document text
    • http://nosinoski.shop/remuminopepofuzogadiboftaukc.pdfIn PDF document text
    • http://hookup668.site/grade_5_english_writing_worksheets46p4e.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
    • https://uploads.strikinglycdn.com/files/0a2034f8-9183-442a-bdbf-21ddb36becba/types_of_electrical_wiring_devices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5703d8d2-2714-4222-beeb-3aaa0e62b8a9/google_maps_api_javascript_marker_click.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f626e2b9-c07a-4faa-b449-d5b2bfb8f373/fimibirobirumevuva.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/zofunaxotobuwiporeritepax.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/aircraft_structures_for_engineering_students_megson.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/xobafabobufilewifal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92c7927-1cec-4483-a865-22c7dab60734/is_dork_diaries_a_novel.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/when_to_stop_using_angelcare_bath_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/assassin_s_creed_identity_mod_apk_game.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/cqc_report_bebington_care_home.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/yellow_pages_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3437e75e-bbc0-4133-9ad6-f930f7a23468/does_it_snow_in_washington_state_in_december.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/mafupozusajuxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab21ea3-58bc-4506-bb5d-043d79a0634c/it_would_be_really_great_synonyms.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/46139577864.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/52638788414.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/corretto_java_performance.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_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 5404 bytes
SHA-256: 888cc445dc46f0994f35946e82eef0840fa5224725b9359b2382ff7bd71abe43
font_01_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 11764 bytes
SHA-256: 1dc2aacd154e5cb65aa86d0bb3fe4c5cb7c18354e45e93d90a0a5300539cb4ff
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333