Malicious PDF — malware analysis report

Static analysis result for SHA-256 971b9a26de42ac60…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 12:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ead3a135f858f074ee051696fcdd5b SHA-1: ca43868416db33ea31db019054f9662bfa04926a SHA-256: 971b9a26de42ac602cbf549104fad79587e8f7dc8ccfceaf4d59f6985686d8ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to other PDF documents. One prominent URL, 'https://gimoguvi.ru/123?utm_term=google+sheets+if+and+then', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=google+sheets+if+and+then
    • https://cdn.sqhk.co/pizililiv/rIvhcH6/best_photo_collage_maker_mac.pdf
    • https://cdn.sqhk.co/sanevujaguda/ejiTjf8/color_of_the_night_movie_free_download.pdf
    • https://cdn.sqhk.co/lojadisexudo/d5L0gfH/clone_wars_season_3_episode_4_dailymotion.pdf
    • https://cdn.sqhk.co/giganopof/Gzijie5/94634766156.pdf
    • https://cdn.sqhk.co/letopoto/CEhd9jc/bonokalidepibako.pdf
    • https://cdn.sqhk.co/nuvexajamu/cggHYA0/94683442478.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobobowu/4661092114.pdf
    • https://uploads.strikinglycdn.com/files/c0890f91-79e5-4988-9b84-d16ef3541a6c/what_is_ode_to_viceroy_about.pdf
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_77ff2017755a4e46a8e2537b3870e597.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5335060c-0d81-4c65-9ee8-1b57579fef26/continuum_mechanics_and_thermodynamics_quartile.pdf
    • https://uploads.strikinglycdn.com/files/27b164e6-66fd-45a8-8112-8278567b8232/fichas_de_lectura_para_segundo_grado_de_primaria.pdf
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_cab8573062454dc09e015efb6caf40d4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbb8ab34-1160-479e-8fac-e494859e837b/plantronics_voyager_pro_hd.pdf
    • https://s3.amazonaws.com/fadobirak/nezujezalonewadoremem.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_274fa996de1f41bb979e392649341b27.pdf?index=true
    • https://s3.amazonaws.com/numegubowalonan/how_to_check_furnace_heat_exchanger_for_leaks.pdf
    • https://uploads.strikinglycdn.com/files/62b7b034-471d-4356-909b-672d089fa2a3/how_to_edit_interior_design_photos_in_photoshop.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_d3d6590e36de4e3fb096ba3bc3e20332.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23615b0d-227d-4ed5-bbb5-951e5b1bb8eb/tudofanigixos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ef.bin
e04f6325c508b1827e49fa6be0fa73a9147bc144f1f61e0f58d0758e47a35206		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 5104 bytes
font_01_sfnt_off0000f950.bin
4fde57a77e4dcb08d31342e5839d4b9c24841b60e0feff39356cf08b8d847066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 11276 bytes

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