Malicious PDF — malware analysis report

Static analysis result for SHA-256 795e25c9bb90e238…

MALICIOUS

PDF

79.0 KB Created: 2021-05-11 16:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17194b2293d62de38a83f8fffe58539 SHA-1: d1b7dfe1b086a7fc9bdeab5568903cf77aab9dd0 SHA-256: 795e25c9bb90e238cc0c523179ca17dd7335424ca3ca2ff29d261110ae1a6a34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a high ML score for maliciousness. The document contains numerous embedded URLs, with at least one pointing to a suspicious domain (xezojetit.ru), suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to potentially harmful content.

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://xezojetit.ru/strik?utm_term=feminist+theory+psychology+definition
    • http://goproonly.com/amar_ujala_e_paper_freecc6hi.pdf
    • http://gobigs.space/comm_of_mass_annual_report_filingaosko.pdf
    • http://doctora.club/it_essentials_final_exam_answers_all_in_oneljqz2.pdf
    • http://jumbochecker.com/14028075349f9gdr.pdf
    • http://bbflowers.net/descargar_el_diario_de_greg_3_pelicula_completa_en_espaol_latinofj9s9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dfa05a6a-ac02-435c-afe3-49d0994d64cb/how_to_talk_about_yourself_in_irish.pdf
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_b5d2153d64ba492eb575f4b658753ff4.pdf?index=true
    • https://s3.amazonaws.com/bojafazes/magnetic_induction_experiment_lab_report.pdf
    • https://uploads.strikinglycdn.com/files/130a3380-56f2-426b-a98a-b4b3dca0139c/skyrim_how_to_use_nexus_mod_manager.pdf
    • https://s3.amazonaws.com/nokiva/glaucoma_treatment_guidelines_canada.pdf
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_b379a87f0ca24ed7bd9413e6aadb54e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c11205cb-b8df-431a-9de3-35279fa6281d/how_to_exercise_authority.pdf
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_4a1cd0df910744a28b4543827f796d32.pdf?index=true
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_304fa8e802a24742a0878544b7bae5c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e8f78bf-a713-4146-ac2b-8dda80c01022/gopro_hero_3_manual_reset.pdf
    • https://uploads.strikinglycdn.com/files/50778c40-73cd-43ce-962a-aa966f1a606d/donojo.pdf
    • https://uploads.strikinglycdn.com/files/d48d263b-91e1-4678-9a0f-6d46c42e236e/image_processing_using_machine_learning.pdf
    • https://s3.amazonaws.com/legapatatezisa/mandated_reporter_michigan_law.pdf
    • https://uploads.strikinglycdn.com/files/12ce1e27-389f-4796-a651-3d009c94758f/mojilugaboderijumuwuve.pdf
    • https://uploads.strikinglycdn.com/files/3e7230c0-5e3e-4366-9857-e0dad22511c1/18326526103.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_off0000f755.bin
f856d4327045457056b751a7e98cfd450b907a5c37aeff240c8167cf5677789a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 5416 bytes
font_01_sfnt_off000109a9.bin
dd310516281a2a8dfb2645545c1853540c912325b0f81709ba24c9a78135c04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 10772 bytes

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