Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f0bf893e4c4ccf…

MALICIOUS

PDF

98.1 KB Created: 2021-04-06 23:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2935306d28866e0e2a1f99e00fe081ce SHA-1: ce5642efeb91a3667a40f1e62207606bf2d7fdd7 SHA-256: b0f0bf893e4c4ccf35d4fb524a31d63b17620be1313ad8c35c50ccb6f9cc7af1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=acidosis+respiratoria+fisiopatologia+pdf PDF link annotation
    • http://erogan-encolumbia.site/how_to_program_a_universal_remote_to_a_sceptre_tveputa.pdfIn PDF document text
    • http://swiss-gear.store/binary_options_trading_tutorialzile2.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/881ce3f8-2cd6-4b87-affa-69c32356ad79/elementary_statistics_using_excel_12th_edition_by_mario_triola.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_d9a962fb0aed4c9e9fedc9f2708db28e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/mowav.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/sketchup_viewer_free_download_for_pc.pdfIn PDF document text
    • http://zitoveruvet.epizy.com/steel_tensile_test_lab_report_conclusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263cf6cb-9d8b-4169-9ae5-2976d812ba41/jugogameteka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98218a5a-3a16-4d5f-807b-70258d188d4e/39506811922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21102287-ed8a-4fbc-be13-ec59b45f3c08/is_the_revenant_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b467b8e-907b-409d-b8a6-5e3a2bb44596/33097535171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0950e855-d86b-4a2d-9846-8a62a2419b22/75705182006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05a5f48-4e58-4a04-98ae-8d0266ba87c4/mathematical_economics_solved_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/que_son_metodos_de_recoleccion_de_datos_estadisticos.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/38997816035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053e4cb2-8b9e-4d34-93b6-48c6df5b366d/72875091143.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_c54339d3be074b258d4d60301025f1d0.pdf?index=trueIn PDF document text
    • http://nidalufexif.epizy.com/heparin_epidural_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/avery_templates_for_word_18160.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_eb87750ec1204d53a90cb62676389fd6.pdf?index=trueIn PDF document text
    • http://nodonukebonona.epizy.com/93361798906.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_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 5312 bytes
SHA-256: 33ceafb900b66be1c8f62e0a6b5bca8ab29d60722a4237a726235a8583406f22
font_01_sfnt_off00015140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15140 12292 bytes
SHA-256: ec70e9be9e40787e79393155c80ee01b4512bf55df7290791d19092a469bb38e