Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce19209616afd938…

MALICIOUS

PDF

82.6 KB Created: 2021-03-27 10:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ae53695e1e9b62f4753c43ad69a1f5a4 SHA-1: fb0cce9551bdba25f6a3aa66511229f07e03e85f SHA-256: ce19209616afd938a0c7d1889a8ef92c225a5d08b9c69859edb4e71af91c1a0d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or content-luring scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=canciones+infantiles+letras+cortas+pdf PDF link annotation
    • http://uscreditcheck.info/ged_study_book_free_download_20192yh4q.pdfIn PDF document text
    • http://s7hmus.org/encyclopedia_of_world_history_bookafgvd.pdfIn PDF document text
    • http://richteam.site/9160855028bc45e.pdfIn PDF document text
    • http://demask.space/31922932608po9do.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://femejedad.epizy.com/collections_book_grade_11_textbook_answers.pdfIn PDF document text
    • http://lonuzokubezuva.epizy.com/truth_table_discrete_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ff2683-8034-4f07-b894-8b7c54858913/74197077171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff85c9d-9cd7-47a2-8486-4ec2c2f5b46f/basketball_offensive_plays_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab9aa84-8a71-4a9b-b8ef-46433fd01610/kunibixipileniputimut.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/resumen_del_libro_de_genesis_de_la_biblia_catolica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b5f5bb-bd03-4b31-a30d-5f41d0876371/sap_warehousing_courses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680dcd32-f274-4855-9b5b-095540da9277/161328413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d789cd1f-e328-4dd7-a3d7-db5c9e23a06a/budufafipegiped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7782640f-dff8-44b7-8bb9-952b8e688937/descargar_libro_de_lecturas_de_primer_grado_sep_1993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268db723-a03c-41cc-9900-182c740588bb/free_verb_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9467f4-e9fc-42e2-be81-7788d09c06a8/how_to_remove_frozen_samsung_ice_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/systematic_review_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/why_is_my_keurig_milk_frother_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3b3ede-45b9-434d-9f9f-eea7cab6a598/xowamugubujugud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 4960 bytes
SHA-256: be150fe1bf096e47a84ef3835a569d879b875c43aee1c6c1d156925a8f783669
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11880 bytes
SHA-256: e255317c3f2d2cfe4c5babd812cfd9febc8a7707ecbea172ae37d975ff24be39
font_03_sfnt_off00012cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230