Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e46492f7e44f4b…

MALICIOUS

PDF

108.9 KB Created: 2021-06-03 10:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b6cbf4a3ae2e66aac52329e01255b2 SHA-1: 45e5260eb2f3af4d74b3c2a8a4b8cec2000577eb SHA-256: 83e46492f7e44f4b5f392e0be054b4ca10f0ce59983fffbfc628b4bb9c39f7e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/pbw?utm_term=lego+harry+potter+and+the+deathly+hallows+part+2+trailer
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/17e0c7.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_60607cf4b158a.pdf
    • https://pazixexawa.weebly.com/uploads/1/3/1/4/131437352/9350828.pdf
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603f7dd351f6a.pdf
    • https://cdn-cms.f-static.net/uploads/4368250/normal_60163191bd615.pdf
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/pewuvig_tanujux.pdf
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/tidogipupi_zubonitemiwoja.pdf
    • https://cdn-cms.f-static.net/uploads/4412780/normal_602232ad14b5d.pdf
    • https://static.s123-cdn-static.com/uploads/4408853/normal_5fddab4f53ae6.pdf
    • https://static.s123-cdn-static.com/uploads/4479213/normal_6005f34fbd42c.pdf
    • https://cdn-cms.f-static.net/uploads/4385848/normal_603fa74aedf94.pdf
    • https://cdn-cms.f-static.net/uploads/4445531/normal_5fe74b867cfc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a92e983f-145c-4c94-80ab-2415a779ce43/76138896590.pdf
    • https://uploads.strikinglycdn.com/files/ea6831bf-2f5c-4c40-aa32-0d58a8b0f9ed/pimupotolarit.pdf
    • http://juvupumanut.pbworks.com/w/file/fetch/144524172/a_plastic_ocean_video_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/3dd9f6e2-a7ce-4ee3-a3b1-aaf6fc0d27f5/is300_manual_transmission_swap_kit.pdf
    • https://uploads.strikinglycdn.com/files/f6e06b86-e061-41e1-98fb-38e5950f981f/91935458408.pdf
    • http://gudikijuruf.pbworks.com/w/file/fetch/144480024/webabujite.pdf
    • http://poforezufovu.pbworks.com/w/file/fetch/144438009/vidmate_app_apk_download_old_version_2017.pdf
    • https://uploads.strikinglycdn.com/files/53249daa-9d64-4e6c-a528-d3edb01b272f/grade_2_english_reading_book.pdf
    • http://banusiv.pbworks.com/w/file/fetch/144454500/tasokevijo.pdf
    • https://uploads.strikinglycdn.com/files/3a1b014c-f6fe-4000-b783-720b81d72b4a/solucionario_matematicas_3_eso_santillana_serie_resuelve.pdf
    • https://uploads.strikinglycdn.com/files/391b2ef3-4735-403a-a89e-195e79d62a10/ms_excel_2007_complete_tutorial_free_download.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_off000168eb.bin
f1cf9dafc760ed1afecb081fe48911b9f2ce83023f99c0b9cfe4ea925eeefe57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168EB 5488 bytes
font_01_sfnt_off00017bb2.bin
1b1cc734a4ff77760d03af2f9edbe2e91c9e7e8f93a1ad88a9e6a740424a23f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB2 11592 bytes

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