Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9d29d0e523900a…

MALICIOUS

PDF

79.3 KB Created: 2021-06-01 02:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8eb3381aaed47204a32482a9037549db SHA-1: 9d0ebc96d7497bb0a42438d59592bab9054d878d SHA-256: 5c9d29d0e523900ace8b437d05a577109279923bda053767b78b22130cb99cce
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 hosted on disposable domains, which is characteristic of SEO link farms used for malicious redirection. One prominent URL, garglob.ru, is presented with a search query for 'zenmate vpn premium', suggesting a lure to trick users into clicking. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/pbw?utm_term=zenmate+vpn+premium+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25B1%25D0%25B5%25D1%2581%25D0%25BF%25D0%25BB%25D0%25B0%25D1%2582%25D0%25BD%25D0%25BE PDF link annotation
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/3f90e61b791999.pdfIn PDF document text
    • https://likukekubusaz.weebly.com/uploads/1/3/1/4/131408788/525047ac4fd8bb.pdfIn PDF document text
    • https://wajodiladifaxuv.weebly.com/uploads/1/3/4/7/134768632/busiradesosi.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/1142910.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/witoxeru.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/ee70ec3c-ae16-428f-934a-ec724923f85e/82950242402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761bdb03-e8b4-4252-8e5e-25d59996f570/42887462420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9447d26d-5b29-4043-ba83-2fdf392fcf46/how_to_choose_implant_dentist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5825b2-5a2b-46c3-a0b1-bbd3462da948/xabifinesederosefokaxi.pdfIn PDF document text
    • http://noxixap.pbworks.com/f/jisiwubutaxaziga.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144421254/cease_and_desist_letter_slander_texas.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/43343784848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e5b73b-043e-4592-a333-d433bed024e8/zijetadusudawivelozesupej.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144427704/building_maintenance_service_agreement_template.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/68024950081.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/ejercicios_de_matematicas_para_segundo_grado_de_secundaria_resueltos.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144417459/what_is_bruno_mars_fathers_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19f1f39-5a13-4133-922d-79ddfbf59a61/82844435316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f715fbb0-246e-4fe4-be5f-77c69db39c68/how_to_sign_into_a_different_netflix_account_on_xbox_one.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/95677922214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469df6f7-1afe-412e-8062-98cfe120a06c/samsung_tv_software_update_error_606.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/treasure_chest_guide_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fba966-fa4b-4258-97e8-4021fae62623/electrical_plan_reading_workbook.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144420762/27976222134.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411645/how_to_connect_vizio_wireless_sound_bar.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/39234225040.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_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 6000 bytes
SHA-256: 55cb6ed6d33ff0fb8a0ca0f06d0f0ecd34ee6618c73e4547449c0b4793e59a5b
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 14588 bytes
SHA-256: ad5eebea0becac9dde07d8d5bae8939ac19717ef573792124d9f4851b98a3105

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