Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fddbf6d8fef79c…

MALICIOUS

PDF

67.6 KB Created: 2020-12-15 13:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e26dc84483cb2b4f30d99347abc9752 SHA-1: 1e4e126631c114754bb4c64eafc36993ce79226e SHA-256: f9fddbf6d8fef79c9fde8a66d134c3df8019e739f3431ac3d221cf6282d6beec
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://gettraff.ru/123?utm_term=national+defense+service+ribbon+bronze+star In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fcbded27e6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fd10bea4bdff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_5fcac8b86fe9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f9dbefe5f4c3.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/5be35c05-4a65-4b74-9c93-2757196bf1e4/cub_scout_academics_and_sports_program_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28400a5bc066edfafdea4/t/5fc557cecb3e0f5771014514/1606768590607/sony_xplod_car_stereo_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/tcc_transcript_request_tallahassee.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/90502248430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9699c916-6f95-42f4-b955-da41919229e4/40565631526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6443c6-a1b3-4bb3-adf2-d6029c323e63/45530542295.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/chelating_agents_and_metal_chelates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fe10cf-67db-47d0-b451-bf9004bcd330/92851058256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3980dce4-117f-4976-89ce-04c1e236fe86/miwalojurud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2486d32-1796-4585-9650-c402a9d1e37f/cal_osha_construction_safety_orders.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 5236 bytes
SHA-256: 88d5f992390d4aad91ddb78c2cb15f1780c54a7fac5ac685cdaec8a3a0fb8e32
font_01_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 10140 bytes
SHA-256: 4570087192641f48934da2386fe5f4d53e80140d04ecd59b839c311c4a06d99b

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