Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb8e2e7f7b6743e…

MALICIOUS

PDF

80.4 KB Created: 2021-06-06 09:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a0bf902fa85b5f95e26286b75007945 SHA-1: 930220bb1620f544ccd50bb35e68b97932a9ced6 SHA-256: 4bb8e2e7f7b6743e79bb044486141097588e3112ec7ced9b8804b0f60685f8a7
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam tactic. One prominent URL, 'https://ketchas.ru/pbw?utm_term=muqabla+ninja+remix+song+download+mp3', is presented in a way that suggests a lure for downloading content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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://ketchas.ru/pbw?utm_term=muqabla+ninja+remix+song+download+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449170/normal_60562e7eeb237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_603528028528c.pdfIn PDF document text
    • https://lubexunomug.weebly.com/uploads/1/3/2/6/132696146/dowejagerol_gufora_ketofo_peromosir.pdfIn PDF document text
    • https://xagofutaruv.weebly.com/uploads/1/3/4/3/134344009/3023d9a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_604b9b7cd7b45.pdfIn PDF document text
    • https://zetidepip.weebly.com/uploads/1/3/4/4/134432407/zikojubuze-pimadapokuwefo-tomuwarol.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368770/normal_60b67becca91c.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/durebakujovesiram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_6023f1d15679b.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/velamokawojunuv-rabupaxifapum-biruxe.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/e7572b36-0118-4cec-9f9e-d355720a1f7d/mojexinowuzurisodovivivom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3792df-fa55-40d1-a9e1-a266ac87e754/masafimigigoxubabarogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377a5c76-5400-49e2-b144-0e2566b44e76/99198678690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d078b41-c248-400d-8fe8-00d8031c20e0/the_art_of_game_design_a_book_of_lenses_third_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca98675-084e-4f00-912d-c85f7c353044/how_to_set_up_my_timex_ironman_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9097801e-4e91-4d42-b35f-b48baa1d027c/95641166309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f2404f-b2e5-4586-b37d-f14b6903075e/free_printable_phonics_alphabet_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aeda261-a4e4-4b3d-aa4e-ec55565ec69e/daneligoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84435aa7-63bc-4a1e-840c-23f65821f2b6/virtual_stock_market_game_free_download.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144467325/best_shaders_for_minecraft_pe_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7206c4b-8fe8-4244-a2a3-1d6d7af5786d/fiwafejonoxadizus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4cc8401-b873-4738-8282-748826f5b807/natowakuginonodefo.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144704733/free_download_english_to_bangla_dictionary_software_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0364b8bc-d188-47f3-808b-d777dd18c012/2229694578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad09bb3-b27b-4a5c-89e0-2531ca3c47eb/43329789247.pdfIn PDF document text
    • http://gurilotav.pbworks.com/w/file/fetch/144672639/93147429478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cce8c3-001e-4ea6-a824-d0664babeb3d/sarelaluwufafe.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_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 5752 bytes
SHA-256: cb92b02c2fd43657bb9cffbb8e9d1f5edf2f57ba463113acdce3f0203d417605
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10712 bytes
SHA-256: 338c013112e4c173d53eee62ca7d47e408498cec966878012915bedfdfc120ac
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361