Malicious PDF — malware analysis report

Static analysis result for SHA-256 8640c78603fdb64f…

MALICIOUS

PDF

76.8 KB Created: 2021-05-12 07:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd3630b999aec578f19c5c7f727f01b7 SHA-1: 86b1e2895c44df7a8b45919f79fba725e2e6db81 SHA-256: 8640c78603fdb64f73aec6c84da9cdffff67ed498fbfb2c6d0595f14e2fe06db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=medieval+crossbow+build In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_600050dce31e8.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/xixobav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_600df834796fc.pdfIn PDF document text
    • http://jesofazom.iblogger.org/remington_electric_chainsaw_repair_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_6069fbee223d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2dafa3223.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/safago/how_to_enable_shortcut_key_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/sevagirokifedude.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_241701d1661742d0bcc8258122974df2.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_5bc649096229459991f5ed2301665376.pdf?index=trueIn PDF document text
    • http://simoronoki.rf.gd/marginal_costing_techniques.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_2bf653c418b1475d99029014cc075ac9.pdf?index=trueIn PDF document text
    • http://kenamumiv.rf.gd/incident_response_playbook_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52e93b9-5787-4d3f-967a-1117734de350/how_to_solve_ie_error_in_lg_washing_machine.pdfIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_2e3d86e3e6714be5892e2b89daff41d6.pdf?index=trueIn PDF document text
    • http://zesugipove.onlinewebshop.net/airtel_postpaid_bill_password.pdfIn PDF document text
    • http://mopuminamopox.epizy.com/bsc_maths_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77f1b21-9371-45b2-a53a-66d1a08b6bb5/how_to_thread_a_new_home_sewing_machine_model_656a.pdfIn PDF document text
    • http://zorumiwopa.rf.gd/logical_fallacies_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/dalogogefuvam.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/what_are_the_first_4_yoga_sutras.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/prisma_guidelines_quality_assessment.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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5228 bytes
SHA-256: 99d2d3781aa2617ec1619e450f6ff47d09e2d514e2e63ccb8142f306ae44e72d
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10536 bytes
SHA-256: ef1d26a2239c274e2b43376e66d341988b3530051fd3e215997b4e744483d6b9

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