Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e0541889e1fc0e…

MALICIOUS

PDF

70.8 KB Created: 2021-02-20 16:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ada8609fc95cbf5de1be23e9cff1a477 SHA-1: 4198b13ff55e58f3e910ba6679856796db79e3da SHA-256: 39e0541889e1fc0e29ad82c1df171b1edbb36e6ef18c033e1fc057cbd46e2ceb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is disguised as an arithmetic test. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL likely leads to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/aws?utm_term=arithmetic+test+with+answers+pdf In PDF document text
    • http://devovonabukuzim.66ghz.com/safudirexinal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_600ebc5cedda3.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/native_american_flute_sheet_music_book.pdfIn PDF document text
    • http://xexulijupofa.iblogger.org/is_ch3cooh_a_weak_electrolyte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466413/normal_5fe283aecf910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/adobe_indesign_cs6_resume_template.pdfIn PDF document text
    • http://kuwokezolofe.epizy.com/cinemagraph_free_android.pdfIn PDF document text
    • http://gamumilow.rf.gd/teguxasizolib.pdfIn PDF document text
    • http://kesufelitam.rf.gd/frasi_analisi_periodo.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/before_sunrise_full_movie_720p_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/federal_rules_of_civil_procedure_2019.pdfIn PDF document text
    • http://xelefufod.rf.gd/65499014904.pdfIn PDF document text
    • http://fatebem.epizy.com/dojofi.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/zufodubosiruwubanovinefut.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/business_intelligence_developer_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/sultans_of_swing_guitar_solo_sheet_music.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_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 5444 bytes
SHA-256: 9c2631ea28f8df8b1f4edea7f6accbfc2b853a53012ed6d145fc9898239c9686
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 11816 bytes
SHA-256: 390c3f8c4e6c8b78df2981daa33ef0a8790e180ce7af8a766e9b72b30cbbf04d

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