Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a632b6f0acec0a8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 13:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 09219532da98a8f391b65f46589d0119 SHA-1: 9fa46da1f8d5d9c8433bf6ee34940f5bdfcb894d SHA-256: 0a632b6f0acec0a8459cd0eab35aa4334d04db079f7f099a4aac9f1de5841a47
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_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous external links, with a primary suspicious URL pointing to 'vilenefex.ru'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or deceptive content, potentially as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://vilenefex.ru/award?keyword=asciidoctorj+pdf+null PDF link annotation
    • http://talezoruvaje.iblogger.org/rokasadesitik.pdfIn PDF document text
    • http://wewedaz.iblogger.org/autocad_lt_2015_installer.pdfIn PDF document text
    • http://disetikala.22web.org/graphic_design_jobs_salary_in_bangladesh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vojapu/89412845656.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/31899887248.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_e4c5a64e42444787b5b1a7edbf46b417.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/dispatch_book_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5be095-3b4a-4e51-8310-3bfc91146cd6/solve_quadratic_equation_worksheet.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_7b0f4f6925224f49961b73f51480f191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/friendship_dp_images_hd.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_33ff0a78db334eb399fc05480ad6bf25.pdf?index=trueIn PDF document text
    • http://zatofax.rf.gd/99857263439.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/dd_wizard_how_many_spells_per_level.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_14b9ce03b8314e099006a527d7f74b87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67fcb1d-56d0-4c64-a4aa-7cb6bcddaec4/macbeth_act_5_scene_5_modern_english.pdfIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_73415d4154144c68b1da489fc28e2f4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98a4bcc-e2e6-4053-9c74-30c8bb144cba/brandon_ingram_draft_profile.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 4768 bytes
SHA-256: 9cd55c656985543cb1028eccfb244d97d69c436b870befea1845bd539e5405d7
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 10936 bytes
SHA-256: 91e540df6121d458f32059f9f855a7718df2180e8725cc01c8dd85b2fb622b3f
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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