Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2d669fb71e0f8f…

MALICIOUS

PDF

85.9 KB Created: 2021-04-29 05:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f4af6f0f995c56b2122931b236b65be SHA-1: 8abe1bf37c5af8c3d5195e8df6a0ad81fa138c31 SHA-256: 4a2d669fb71e0f8f6d9cd298b7b17aac1bc61c6698f753ccbad554c11e56f68a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to obscure the true destination. No scripts were extracted, but the overall structure and URL findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jacksth.ru/strik?utm_term=diana+her+true+story+first+edition PDF link annotation
    • https://cdn.sqhk.co/lenawemijixe/N0ghaDH/jefopewomegumudax.pdfIn PDF document text
    • http://migunovaj.iblogger.org/can_you_make_beef_sticks_in_a_dehydrator.pdfIn PDF document text
    • http://gibafafe.22web.org/72270430525.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/iNwZyha/shareit_apk_download_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/9UEJgjq/nulikizuwozitiketepatu.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/lupozad.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/XDUgAqf/68180165258.pdfIn PDF document text
    • http://mipedinujit.22web.org/zijul.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/1b897988-b1f4-4c05-acc9-236825f5b0f6/how_stuff_works_internal_combustion_engine.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/funza_lushaka_bursary_application_form_for_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/bose_901_series_iv_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/column_chart_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35361f60-d70d-43e8-8279-3e4361b4f4cd/fluke_t5_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d0ed37-3682-461e-98aa-6ee16e2ef904/pieta_prayer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/20955446682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed5a814-d364-4711-a415-fa64410da512/22164328217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3131e8-d140-478b-bf0d-be6fc7f70a7c/2347816678.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/dbm_year_end_bonus_guidelines.pdfIn PDF document text
    • http://nenowunadiwem.epizy.com/inverse_proportion_questions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/convict_conditioning_handstand_push_up_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9fe8cc-5eb6-44ce-a23e-82f533ae7c4e/kuta_software_infinite_geometry_using_similar_polygons_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ca1667-11ff-4ead-ae8b-e197d628846e/rilubezidoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b73e8f-8a5e-49e2-a649-24006bb29ae1/lebalomupite.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 5064 bytes
SHA-256: 1f579ef5a0709952c5f98d1e220ffb029806b0568ee4aca8f3972a4357fc94b2
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 2004 bytes
SHA-256: 1ccfdb965ac1c7a735855f6c27e3edda1425c3432a388fdbc3eb9e884b12240a
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 11140 bytes
SHA-256: 014715d235f277d7424a129e24a1895d8431799a298e1cd7c71221542f8f5678
font_03_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16756 bytes
SHA-256: 2660e3f19262e0c1c514f7a0045fa503cee1831b49ccf21a997877b0058606e8

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