Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3b87a52636ac40…

MALICIOUS

PDF

80.5 KB Created: 2020-11-24 21:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 48c74f353e711ae9b505509efe826495 SHA-1: 9dc5cc46f673b322359bb3f66fc854519f29b4fc SHA-256: 9c3b87a52636ac40645832f5a0be4ac2dd8c64783f2b11eb9e2e944ab4359cf0
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=peavey+bandit+112+red+stripe+schematic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_5fad9ea60d2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5fb5dbd5a6e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8eb1dbf3b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fba4b3d4f033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fb37f528521c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5f9a29f77fb88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fb3f0c6928b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_5f9d6049428c6.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/363d1eb2-b87f-4881-8ffc-93fa7909bad1/27218427547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6c844d-9fe5-453a-ad47-bd5f33fc192e/nhng_g_c_ngha_l_fwm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705bdc63-0bc2-4123-892d-8607c68692b2/monster_hunter_world_weapons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936c0193-17ad-4e40-a528-83120bf2ff2d/topizidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e185829a-0607-460d-8986-72570a32566c/velowin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46712675-77d1-4c5d-84ce-3e6ebdba4845/elmcroft_senior_living_employee_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231e6c9c-4ce8-4366-9026-4f7820cf87fa/turn_off_driver_updates_windows_10_1903.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_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 5768 bytes
SHA-256: 3712357485fd5eb75f0f7c44f55759e1ecda4ae32c2056f5161907b5187d06e4
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 11460 bytes
SHA-256: 7f37fb375de354bbdc0e7d148689dd572b5db8304fe8c3ac7a3fecd2fdd768c4

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