Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c1915825612ac2…

MALICIOUS

PDF

70.3 KB Created: 2020-12-17 18:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2b904b81f0255f932e818739640b8638 SHA-1: 9f6be3e0d157c1e30bb809b05762b4ce865e6373 SHA-256: 45c1915825612ac25887b4c5494876c53395f25346d93992ec19c92d532916a5
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://traffnew.ru/123?utm_term=suma+de+fracciones+diferente+denominador', which is likely a phishing or malware distribution site. The document body, though partially corrupted, suggests an educational context ('Suma de fracciones diferente denominador'), which is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffnew.ru/123?utm_term=suma+de+fracciones+diferente+denominador PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f88c02861dd9.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://uploads.strikinglycdn.com/files/82a03fab-dee3-44b9-8fb7-94ff3b49aed4/10296000776.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/c_r_s_u_university_date_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36af7c19-05cc-480e-a2fb-3b9c1b963fbd/isosceles_and_equilateral_triangles_worksheet_15-2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139c0125-67d3-4f2d-9d52-665d93177f2c/japefijirisemozo.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/weekly_menu_planner_free_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1619768612547ed61873d/t/5fc3232a4e98326c0277ee70/1606624044954/paea_eor_study_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97930228-08db-44c9-b2c2-808d036412c7/20810283227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6b9e5d-ba3c-4804-afd4-1c7e84ff5028/93085747033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1f61e1-7e52-47d7-adab-93e2e88d310a/ai_persona_4_golden_social_link.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e600c7-9036-46a7-9ee7-16a865938336/nazabexutadaxowilarojamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efdb702-0e65-4eb2-87f6-7608a8aab650/49878030904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f0dcf5-2d8f-4b2a-aaaf-be232d593f25/sac_city_unified_board_meeting.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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 5120 bytes
SHA-256: 383328579dc9922610dd903b1ffe6b557511fd374c0c3f577d66015b4fb535e0
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 11008 bytes
SHA-256: a29d28b42e00bcbe0fa5838e3f0ae72bb1a2ff95621b50ffa55a0035ac9668c0
font_02_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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