Malicious PDF — malware analysis report

Static analysis result for SHA-256 782c3cd8bbce0537…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 04:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c205e81279cd999a2afc3f1fcc303745 SHA-1: c405845cf8e0a53ac33387d5c67f61859efb0aea SHA-256: 782c3cd8bbce05371969fda8e358d899c29153768e07a51196f94b58dd3087ae
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xajibur.ru/wix?keyword=comentario+biblico+matthew+henry+pdf PDF link annotation
    • http://xiruzox.mygamesonline.org/89879619898.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/10_tricky_interview_questions_answers.pdfIn PDF document text
    • http://migriruy.ru/ark_cross_platform_non_dedicated_serverp4xw6.pdfIn PDF document text
    • http://lnstagramsecurity.net/is_there_going_to_be_a_warrior_cat_movie4h911.pdfIn PDF document text
    • http://weraka.online/streamer_life_simulator_steam_keywbfph.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/vowafufelotedu.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/15394500609.pdfIn PDF document text
    • http://luxshop21.site/64719803015yjcxo.pdfIn PDF document text
    • http://strita.space/binomial_theorem_expansion_formulalk7ga.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/17915083222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_bf2c9d80f92047aea9c12ab0580bdcf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/fishing_report_rochester_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f354c6c9-fcf8-49bd-86a4-d613ac69d9f1/dragon_bookends_amazon.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_9f99b79bdfb54c3cae9fd45d094a4c3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b45aaac-0d94-4499-93ea-3508cc7cc566/57962637504.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_a75ebb9981ce4b208b844d54db4f902a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/baxumanezuxerigel.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/wixolulobesi.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_9c6edd89f37b434aadc9aa721936fe30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5960b1-7e67-44cc-990f-feff2186af7b/womens_air_force_1_pixel_white_black-sail.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/wedding_invitation_website_free.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_9d4a0c1fa2d149fbaed58633b42587bd.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_a425e76ae8c24fdcb5cb49b00da6814b.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_fd3167d268a04924b43d31c06e6bb0b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geraromu/archery_king_apk_revdl.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_eeb5d33685854e9ba7ea1c14c0eead3b.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_1bdc6f0fdbc0482ca078c97f7e50ce58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda7ae79-2ddf-4793-925a-28ccee6d188e/kigem.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_d475c058cd1e4d09ac3d98049b51a846.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/288c2ef1-1062-436b-a01e-53bcb6dfe3e7/augustine_confessions_summary_book_7.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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 5456 bytes
SHA-256: 7a525179d2c1968431c95853be7178d494f1d3cba7a74e8c212a1815e248ef71
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 11488 bytes
SHA-256: 5ae7f45a3550312d25ea6cc34b9978ea221fd31215ea9ba84cf7622fbeb31e57