Malicious PDF — malware analysis report

Static analysis result for SHA-256 373d24721d30f8de…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 17:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fbde3d49bae808908e25242fac619846 SHA-1: 4d21a0dcb86a77ffec4e4e152bb05fe546829f22 SHA-256: 373d24721d30f8de4035e51c5f499d793d19df3d2b05cf2863bcf7ec720b1261
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 0.9993

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://dafemum.ru/award?keyword=3+bedroom+bungalow+house+plans+pdf PDF link annotation
    • https://cdn.sqhk.co/rarukaboz/haiahjs/spin_bubble_shooter_online_game.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/bodybuilding_workout_chart_in_tamil.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/ilive_32_bluetooth_sound_bar_how_to_connect.pdfIn PDF document text
    • http://afracheat4.xyz/legepilisorexanosexunavoa2fig.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/615obhe/ruvezevebanuva.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/hhieHge/26686938746.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/biochemistry_textbook.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/black_s_law_dictionary_tenth_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ffea02e2b8c1.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/P1gjYj7/rorigad.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/jhfibgf/amtrak_schedule_los_angeles_to_oceanside.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/cf68hbX/best_free_parental_control_app_for_iphone_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jusupovexewa/cLdVTth/43962910899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_606a181c0d808.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/active_passive_voice_exercises_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff33df9e3d03.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/nnjajf7/dukoxe.pdfIn PDF document text
    • http://idealica-ufficiale.site/niwomorolekafekomogibumh92x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fe7cd5b3ec8f.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/9cbed6aa-8f73-4f68-a622-839d79721a75/nebefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ca6816-df3a-448b-aeb3-619fc8bed680/rita_mulcahy_pmp_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0631b8f-fb99-4c0c-95b7-100b30cec3f0/30103355306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30fd567-0d02-4f3c-88f5-7958ca65d3ea/67282261149.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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 5756 bytes
SHA-256: 5cfe1f51bf6960430bda0a2c029d68c81380b3eb063a155a0dd39f883d4954cb
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 11120 bytes
SHA-256: 4ccb6417061f5b74a503c07d86c16b88476649a08edfebe26c91ada8e5d69983