Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf1159e0c0fb11a…

MALICIOUS

PDF

64.2 KB Created: 2020-11-19 02:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9ea1db39611adb67ca6b6398480a2830 SHA-1: 15851468f8b45766ae72fae1dfa6b1d76d4c50a7 SHA-256: 8cf1159e0c0fb11a1e569fd3c40bdb1bf095a06575b8cb574f1641a0163a1786
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 0.9998

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://ggtraff.ru/123?utm_term=writing+hub+ucsd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5f9b5e051c59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_5f9f3721e63b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f999dee3cf20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5faff3c8a6dc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae36616-15ba-46dd-b895-dd9c2907a53c/24509757237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8833eb62-45fd-4e6c-a8b2-b9ddb5ae34b1/nervios_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/fraction_worksheets_4th_grade_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/cattle_breeds_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc5997c-e805-45ce-a1fe-1b2555578eb3/dimorul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9773beb-a57f-41d3-bef0-250184d58a05/gates_macginitie_reading_test_level_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95988191-07cf-494b-8227-efd9dd82941e/cartoon_body_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174dca80-187b-4f7f-8dcd-ee8c2ae21dd5/parametric_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fb973f-da2b-481c-9d38-568ea939519d/36772762420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3159f5f-43c8-48fd-af76-5e06e3e5e087/solusio_plasenta_adalah.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_off0000bf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 5112 bytes
SHA-256: e782b3a60666360e2fa242d8510e6abbae2b9c62a09d77bf82ae87813aa792dc
font_01_sfnt_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 10224 bytes
SHA-256: 257180b951a0a8a91b520bf792a037f87aa804e37495215685857abe70f24813

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