Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a66d525bcb45e24…

MALICIOUS

PDF

70.3 KB Created: 2020-12-04 23:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: db924bcdf8f593609671f00d3a7fd87b SHA-1: bf7ce95f4ca7c9a95b2b53908f110b7e45123065 SHA-256: 5a66d525bcb45e242bd11fcffdc1a42a867b292a70fd2e4d87f6b863b45a488e
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=business+letter+for+becoming+partnership+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f88f8ca7a8f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f8a19ef1720b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fbbd0d2a673f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_5f92a878d5d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5f8ff2b4bba6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5fb5891e6dddb.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/19fe0a47-2dff-4d1c-b45a-8e9bb3257050/e4_games_impossible_quiz_book_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2713ef1-afd1-44b0-922f-4d37fc80d808/nedaguzifimavaxevigo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79e3dc39fde0238aaf1fa/t/5fc844326031f47386199e1d/1606960178915/75462681715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43bb041e-344a-44ea-bc9b-f8d6b46686ff/power_problems_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd32e0376c5c1e4b98458a/1606234849323/settlers_of_catan_printable.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf60981972c46e3c9671e1/1606377628812/garlond_steel_ffxiv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9fec917750a3d7b949/t/5fc2f910a97599144e5a5b8e/1606613270210/making_thyme_for_health_chickpea_tikka_masala.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_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 5640 bytes
SHA-256: bc1effd30d2d2d86f884995f6964fabcda11e26732fc17df9bd30b9da78ce333
font_01_sfnt_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 10468 bytes
SHA-256: ef9fb182da136b5bda85f1f261ffc51364dcfb3b53bae4ab24084fa7cc224ed3
font_02_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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