Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b25909fe219a84…

MALICIOUS

PDF

81.2 KB Created: 2021-04-09 06:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eae27f271228b068e2848747d0a3f45e SHA-1: 873548caa2aebd9ae711562e782391d95047ed23 SHA-256: 37b25909fe219a84872112b9a23a2093e0b7a16d1e06aa5db1a0246252ab1348
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=kaplan+mcat+books+pdf+free+download+reddit PDF link annotation
    • https://cdn.sqhk.co/rutisifelom/gdzhdje/choices_stories_you_play_vip_subscription.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/gg4iaih/75561496305.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/gfGLSs6/ninja_parkour_jump_xl.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/djiHijx/happy_color_color_by_number_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/jegfjiB/77563604986.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
    • https://uploads.strikinglycdn.com/files/f4262998-d042-4eb2-866e-0c1f7b3f4c20/sekamojegijarakazutug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f65135d-7cea-473c-bfec-bf381bde57ac/dakelazozitilasamisetut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656b4219-649c-4296-9c13-dbbee2630e56/lisodate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d34478c-b585-4b80-8003-b1e6e9a78b89/how_much_does_a_big_buck_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c16eaef-5207-499c-8e2b-44f79c92c530/96836099986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ec8cdb-fa61-4bdb-be57-305e413ef95f/jedasizixoxaw.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_fdfd96ea980d42a9a846eeb7d1b69d8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c62c94-d4b3-4641-93c9-6e9a84a5ab1e/soccer_conditioning_workouts_at_home.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_0a4b56dc131149beb5721eb4f116d6dd.pdf?index=trueIn PDF document text
    • http://nodubibinidam.epizy.com/angry_birds_friends_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a5de1f-6aae-466c-9ca5-2da03744c08d/la_catedral_del_mar_serie_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cdafba-7283-4653-8cfb-30b53561a482/best_books_for_stock_market_beginners_reddit.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_aa5b6c43e1a94d13b5195d925e1aa2e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6a4a43-4396-424d-994b-5187d61c576e/how_to_turn_food_waste_into_compost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36743a6c-db37-4f35-b991-21770db769bf/givomifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042af140-2b55-44ab-81d4-c5562a9e3613/cancin_de_hielo_y_fuego_el_juego_de_miniaturas_contenido.pdfIn PDF document text
    • http://bofujobovunuj.epizy.com/c._baermann_complete_method_for_clarinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f20a22-675b-4d66-9240-42b721d8571e/how_old_is_percy_jackson_in_the_last_book.pdfIn PDF document text
    • http://jovifididapop.epizy.com/fosil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98a7f20-ada0-4a5e-b9d4-524f7dae8466/sinizinuferogubuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5356 bytes
SHA-256: 43fefc47134fad05a9f1c234e2f2979c920cda2ec1d451c533eb1ff92b1d50d6
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 11352 bytes
SHA-256: 46709d330b0471b54f98a04ee416db1d0d7347bb57516a977ca87b9d16b3bb87
font_02_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3