Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5e860c8f0db5d0…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 07:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b0aee9261910e01f96affd6412c31082 SHA-1: 0984ab0abd01fd85ffaf37f7bf42d92d20d8b105 SHA-256: af5e860c8f0db5d0e613a466f9b56f61ce9c6e023b6a345eb1a4d2816b869f46
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://resalured.ru/strik?utm_term=how+to+turn+off+touch+screen+on+kindle+fire PDF link annotation
    • http://xeberok.getenjoyment.net/55206412493.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/gjd622E/aceable_final_exam_answers_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/8ghLmYo/ganojugided.pdfIn PDF document text
    • http://desekikimok.22web.org/wezigawotasafofazanewuz.pdfIn PDF document text
    • http://prizinsta365.online/how_to_write_compare_and_contrast_essayr6x3n.pdfIn PDF document text
    • http://reduslim-shop.site/sopumoxigujevajupafadifj8kyc.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/50590611026.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/jghgj2d/63630981073.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/Mlhfrhd/rap_battle_app.pdfIn PDF document text
    • http://teaitalis.space/xidifemop5zo3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runakuzubob.rf.gd/usmc_cbrn_individual_survival_measures_test_answers.pdfIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_37dd3b0a4209455784333842332544c8.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/nafufazo.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_a2586c44617b45f1bf0d40acee2aed8d.pdf?index=trueIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/dork_diaries_book_15_free_online.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/84170272254.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_672c2d1fb0e047b6a01976a104a51465.pdf?index=trueIn PDF document text
    • http://bogalibamadom.myartsonline.com/vapositokekix.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/kicker_hideaway_settings_f150.pdfIn PDF document text
    • http://sumawimibodi.rf.gd/74573018671.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_60963360e8904d199315a35cd5098f20.pdf?index=trueIn 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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5016 bytes
SHA-256: cb3e68cac2175c5f8f750da121618a82224b8320efffb15d12c2315916108e96
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 11368 bytes
SHA-256: 32ad95ef49086be32d3ce8c6393e080147411bf9cf58eb9c9428ecbcdb98438a

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