Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a27a5fbea613994…

MALICIOUS

PDF

67.7 KB Created: 2020-12-17 19:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ef4a4c78f49c4c72894f0795440bacd SHA-1: ef883951e3de8cc758729358ff4fb838cb46764f SHA-256: 4a27a5fbea613994e26088e777e492a071e9fe8d7faa55e9d58bf3f45408e829
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=short+basketball+players+2020'. This URL is presented within the document's content, suggesting a phishing or redirection attempt. The ML classifier and ClamAV also flagged this PDF as malicious, reinforcing the assessment of a phishing lure.

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://gettraff.ru/123?utm_term=short+basketball+players+2020 In PDF document text
    • https://narigepafosi.weebly.com/uploads/1/3/4/4/134471788/babazekexabo-liguv-zisisuvex.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/8252bb83ceaebd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4e82bbd14ff0dd2b64c2c/t/5fc94cbb961abb1b1f755f04/1607027900806/real_estate_open_house_sign_in_sheet_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce7c23a975870c670d92f2/t/5fd027d33bcf75077a789e5a/1607477203699/lugenakefunopazabizen.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/77283613530.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/kuxipudajawalijute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c99668d-d34f-496d-8a2c-bbbfbe01ce5a/etude_de_march_airbnb.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/beads_making_tutorials.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0baae3dfdd95b60d439b1/t/5fcc27a25d2e6f3bda2d809d/1607215011921/samsung_s10_ringtone_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc101b088c99b6d37a7afc3/t/5fc99772887b444c614f8831/1607047026799/sheet_music_jump_van_halen_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992dacb0-b031-40ec-b308-441b98f69f24/trig_identities_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/mechanical_engineering_interview_questions_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52be63398ff751549a8ba/t/5fcb57d19d29b56e4d00a504/1607161809317/ptcl_bill_check_account_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bfacbe-60ce-4428-9ecb-15ff7cb9ab56/satellite_communication_by_vs_bagad.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53833c6ccf69f35536eb/1606374275857/black_friday_jokes.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_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 5588 bytes
SHA-256: d665ff93a43e20388e4d1bf7ab2a332a2dfaf0fbf8ffd176509d4fd99d581bc6
font_01_sfnt_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10756 bytes
SHA-256: 35f952e3ee2f8cecc968eb2971e6baccf24dd0f5e864883186ff0aae486297dd

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