Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19d1b4a17bdaf93…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 09:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e8908e4b33f01be203b9611ab502b765 SHA-1: a80543b6c55e536933f52cbc7bdc2ab929e60325 SHA-256: d19d1b4a17bdaf93bb44bef4e8673f58f9aaa4d8ab6128d955b2b7d97b8625f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure related to educational certificates. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ponafet.ru/strik?utm_term=mcgraw+hill+education+certificate+german PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479439/normal_600d095fc01a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_602f4c5d709dd.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/jjcjeDt/draw_cartoons_2_pro_apkpure.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/rogidolotodinisewoxuxelaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_601d6200a91f7.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/henjgiC/cube_crash_mindjolt.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/egjujdY/sony_ps4_rebuild_database_in_safe_mode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_602451c79fff5.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/jYJATNV/tusoranawotilabujib.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/a_wrinkle_in_time_chapter_11.pdfIn PDF document text
    • http://sikakapu.medianewsonline.com/vafedajevepuzodewuragax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timeziso/asp.net_mvc_project_ideas_for_beginners.pdfIn PDF document text
    • http://zijedan.atwebpages.com/wade_s_rules_boranes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da4ae4e-4e05-49fa-8d1b-1be30d12bb5f/determine_the_force_in_each_member_of_the_truss_shown_in_figure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a629ca2-4a19-4a1c-8ad5-d1f6a0c231db/wizafokalesofefu.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/what_are_the_layers_of_iot_protocol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544d64d7-fc40-4025-9af1-2f4d73ada0cc/does_rambo_die_at_the_end_of_last_blood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af99294d-48c1-43ee-807a-4ddd95be96f7/schlage_electronic_lock_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/how_do_i_preheat_my_masterbuilt_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352342d8-e4e1-4726-a9fe-9f916280a9ee/moon_phase_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b85a489-1fc2-44b8-9914-603a1a704813/how_much_did_a_bike_cost_in_1950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea87be7-2623-4131-bf0c-f72dedf13900/zigab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046f2e4a-48f0-4e7b-a856-8252bc5ba237/69220323628.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/how_to_identify_fruit_trees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3649d32e-bbbe-45ef-a82d-c6c17bbe217b/reflexive_verbs_spanish_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/28924198617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c1cc76-2c5e-41d1-83e2-f1878d5bc89c/xaluxuzejezukisowanef.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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 5356 bytes
SHA-256: 5e95345311b1f8ea16e09b39c14c867e69228f2b5f5ea6d17cebf6f01c1e0cca
font_01_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 11460 bytes
SHA-256: 78d64d9a2966c0724428be2e6d1f605939a7ed827b3475743c7e9a260957ccc1

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