Malicious PDF — malware analysis report

Static analysis result for SHA-256 878da2509ae01f40…

MALICIOUS

PDF

72.9 KB Created: 2021-06-10 14:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 982969d820a0832524d253df0d9c863f SHA-1: a831b89988c5a963a0211035d4afc9f06a7e3a3e SHA-256: 878da2509ae01f4000f7857f158ce9fb47c0c2770813d99cff57c71a2eef0a15
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=new+song+download+pagalworld+mp4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5fdba48ba4164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_606e673425e25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144941952/56191653018.pdfIn PDF document text
    • http://bijinim.pbworks.com/w/file/fetch/144756492/what_is_the_primary_difference_between_prokaryotic_and_eukaryotic_cells.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/what_does_george_tell_lennie_before_shooting_him.pdfIn PDF document text
    • http://kobowal.pbworks.com/f/windows_10_pro_iso_files.pdfIn PDF document text
    • http://japakekuwita.pbworks.com/f/living_things_and_their_habitats_year_4_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2725f8-be94-45eb-ba92-b194e3b09aed/96920896138.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144506715/65121350552.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144437322/google_play_gift_card_generator_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff350e9-bf0d-43f8-b164-130a52b6059b/butipopevakedovikupem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae01c02-985d-41f7-9029-8718ca68c86d/canon_dslr_rebel_xti_review.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/43190799745.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/pokemon_games_for_android_apk_download.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/w/file/fetch/144504684/26420301408.pdfIn PDF document text
    • http://lakobun.pbworks.com/f/gujowanixexunon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2077098b-89ba-4ce5-9569-4f24afde79fd/what_is_the_root_word_for_automaton.pdfIn PDF document text
    • http://tujedet.pbworks.com/f/tamil_dubbed_2021_movie_download.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/movetaxevezanidazotemu.pdfIn PDF document text
    • http://zulamiz.pbworks.com/w/file/fetch/144706521/gulusigutopuwimam.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144753345/how_to_write_a_loan_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b07a9df-72d2-40e1-b095-ca127e22bbb2/bupelevukikonujinuwere.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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 5428 bytes
SHA-256: dda11503ca920378b4652993038a4a43f514e0d0f572d6ea6f45fee67b0f4090
font_01_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 10900 bytes
SHA-256: 7d379f62ef5439f3bba607ededbfc94eb9aa2541ff9b710045b6cd931ac59cf1

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