Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b78c2e3d473253…

MALICIOUS

PDF

80.0 KB Created: 2021-05-29 23:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05bf764657e34982bbb9f5b65b5250f2 SHA-1: 7c4f0faf824779581ba104c1f5d244ecd0ebdae7 SHA-256: 12b78c2e3d4732537173454df388112863d9cb6319f8f263555b38baa1d54484
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/wb?keyword=is%20the%20stranger%20things%20a%20book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5ffd7d3f19ee8.pdfIn PDF document text
    • https://zefipoxiba.weebly.com/uploads/1/3/2/6/132681281/gomezata.pdfIn PDF document text
    • https://zazewefagawi.weebly.com/uploads/1/3/0/7/130776698/ketodevifebaxil.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/0e04dc05c19d43.pdfIn PDF document text
    • https://reganumezeku.weebly.com/uploads/1/3/4/7/134749319/7770359.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/fb8e9e9.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/kegujatav_vogan_regogokuvuzu_durivajadujufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_605be088138a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5fdb85c4b1bac.pdfIn PDF document text
    • https://xuminewas.weebly.com/uploads/1/3/7/5/137500686/41d372f295ae.pdfIn PDF document text
    • https://xatosupitoso.weebly.com/uploads/1/3/4/0/134018334/5339103.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/95d06bfe-5690-4a79-ace2-9fdee9b80264/wordpress_plugin_check_folder_permissions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d2b299-e333-4179-b1b3-b0034b56a720/98570228498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1f12af-b379-4b72-8f89-1ac0e478348b/91935799484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2943d5bd-64ae-4b51-bb66-91dc2603fb5d/troy_bilt_lawn_mower_tb230_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66195dd9-b70a-44d3-b688-9983026b3218/40365486081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff35a6a-d023-46ed-bdc7-1908ab97d33b/xolonozizosozizokojik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8b7624-76d8-431e-b4ae-688e7d0be59e/computer_network_technician_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b751a3-c469-4f7f-bb3d-2778955d0a6c/what_are_the_3_stages_of_active_listening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1197c8b1-d6a8-4694-8ace-0b3fc9e575d3/27930258838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6322d81a-404e-404a-9113-bbd01b9354fc/why_isnt_my_ge_washer_draining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa61cc31-77c2-48df-bbee-fe3f82ba6f94/yamaha_outboard_service_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d760fac-e520-44a1-a94d-54149d60a688/because_this_must_be_nils_frahm_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d417b67e-14f6-4d37-8a2c-92b42d950a9b/volvo_xc90_owners_manual_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c95d962-b3a4-4920-b739-228341893465/41114064950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b0f3a8-196c-4e3d-96d7-08b26a4fcad6/america_the_essential_learning_edition_second_edition_vol._2.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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 5056 bytes
SHA-256: 2a983cd3c7981e7c8917d32da647e969ae30afd59ebbca02e2b34ae537a00fa2
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 10472 bytes
SHA-256: 3b043fb4b2f924101dd844c02693e4c217dcbb6fb5c2dba204ecf765198cd0bd

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