Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f73da5659e23f64…

MALICIOUS

PDF

71.3 KB Created: 2021-03-30 16:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8bece6ea6f17509c47132b833a323a39 SHA-1: 5a7168779959199825d4d731ef4ba7ef8831a28a SHA-256: 5f73da5659e23f64d6519dc9d853879202b8d393b33b678056d9da2ff39b5b81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://maypoin.ru/award?keyword=drug+metabolism+pdf+free+download PDF link annotation
    • http://gukiduwonaxinef.getenjoyment.net/hp_elitebook_8540p_service_manual.pdfIn PDF document text
    • http://usejus.club/how_to_use_ge_front_load_washerp5od1.pdfIn PDF document text
    • http://hotita.fun/avanset_vce_crackazvhh.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerefe/jJ7iRNq/herringbone_floor_installation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/kbnujjy/best_audio_recorder_app_for_singing.pdfIn PDF document text
    • http://jusapp.club/105809527873423c.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/jggU7nV/world_war_ii_test_quizlet.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/53929504726.pdfIn PDF document text
    • http://lixusopo.mywebcommunity.org/vazanetigikulosalatuparum.pdfIn PDF document text
    • http://memisada.mygamesonline.org/third_grade_spelling_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/pegiridireva/gigqcmS/azure_cli_commands.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/parallel_computer_organization_and_design_solution_manual5p3wn.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/4e8ce2d5-230f-4560-bc4f-36ed99dfb679/que_es_un_editor_de_presentaciones_con_diapositivas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce57b68-f076-4062-9c1f-4676178e79c3/16302458825.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/pudekuteginelemazumilu.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/femexatonobakotuve.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/89176682693.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/25572598128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0187b4c9-1232-402a-8a18-e52a8c2b7d08/87485505452.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/age_of_absolutism_dates.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 5592 bytes
SHA-256: 73f904004ae5f043135fa277399db497fe34ea0bf8f18a9cc6450ee61416cd71
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10248 bytes
SHA-256: 33c55e494d7f2641a666c0ac6ce62d9100c18598975220999bf1176b3a384c5c

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