Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba992ca249e9be2…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 18:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd256ac2f92ec720b54d5fd4b613db81 SHA-1: b38aa796e41d569f64ed6efebc89531824f66aee SHA-256: 0ba992ca249e9be2b118276de414ae35a8aa66cabcd394cbc66d5ffa897d69d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9993

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=when+our+worlds+collide+movie+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501486/normal_603a42db93d3b.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/bootstrap_4_material_design_admin_template_free9y6nx.pdfIn PDF document text
    • http://operationhomeplate.com/alimentacion_saludable_para_diabeticos_e_hipertensosfq0gm.pdfIn PDF document text
    • http://dvigatel.guru/jio_mobile_video_calling_karne_ka_appsx01o3.pdfIn PDF document text
    • http://mmmmmme.space/panchatantra_odia_storyqx4an.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455681/normal_6041b1d5a6b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_60365ad9c0f2c.pdfIn PDF document text
    • http://dmdmassage.com/hp_5520_printer_wireless_setup2lhuv.pdfIn PDF document text
    • http://instas.site/13020618798ftvrd.pdfIn PDF document text
    • http://dayzcommunity.info/picture_collage_frame_ideas1p323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445116/normal_5fe5525089cfe.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/1b960fdb-9012-4750-873a-ec696618c454/associated_laguerre_polynomials.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_1c61d92393ff46f69360df9eb445795a.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_63a3d5d1094f4e01871d518d421403b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fe6f8b-e26a-4130-943f-b05209cfd91d/what_is_the_si_unit_of_radius_of_gyration.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_36f1f8dde796421485dec48c0ab63e9f.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_a96ab9643e0a4b06a0657645155729b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de28cf39-6f28-44c3-8901-688094715db8/45077710801.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_360af410c4624036a3a8a8eb64441365.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_3489a2933a7446389651c633129fb6e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9bb5484-f9ac-413b-b624-4afe85868d67/how_to_set_an_intermatic_timer.pdfIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_46336bb466db45f3afa23f134cd23896.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/713d2c52-8581-44aa-8595-617314a11fed/surface_area_triangular_prism_formula_example.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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5408 bytes
SHA-256: 209e3b65cd055d69651a30cf166198b9cee3bb09dd585536ef3b9ddef96a5869
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10684 bytes
SHA-256: 82bd2530a6c50933827185286fffe28e46b47c6dc49bec4dade952e864fbfb91