Malicious PDF — malware analysis report

Static analysis result for SHA-256 50025d394fd85797…

MALICIOUS

PDF

76.7 KB Created: 2020-12-25 09:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6681502cc38ac852ca97116300f76f66 SHA-1: 9cd61c4f23693c18179ef0c19a1dfe2e1617ea03 SHA-256: 50025d394fd857972527626648ae577b81fe3a4cd9257be76a35c78e239185c8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL is disguised as a promotional advertisement for a "Best Buy appliance packages labor day sale" to entice users to click. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://cctraff.ru/123?utm_term=best+buy+appliance+packages+labor+day+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_5fadf488377ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fad67cae8b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_5fdc61d8ad364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5faab3452c4ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fc06f4812c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_5f97488981276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_5fe242aa2ce19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5fa94bc3e6aa3.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/b1e60a9c-565c-464e-b77b-61d50a893e2f/putting_out_system_industrial_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab87df2-1d5b-4210-b876-3bd34fb7bf6d/98556872326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9c41d1-9bc7-4c11-ade6-64f8cf723865/common_man_concord_rest_stop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25760fdc-2d33-4822-b482-f89576008f35/easy_cake_recipes_from_scratch_chocolate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20cf038-e850-4aca-a07f-9b7c19c57e20/redade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea2365f-bec6-4432-8876-cdfdd0cc43bf/thinking_map_templates_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddd6e16-7bb9-4fc5-a2a5-6ffa2b18d24c/peinados_para_nias_faciles.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_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 5596 bytes
SHA-256: e7ad0b56915b549abe45b45cd381f63a2fe19624a2a96ce8b74027c47a29e34f
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10644 bytes
SHA-256: 610aa3f43dd4b052aa92cdc7bc6029e28b03066d8cee6978a052fe35539b84a2

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