Malicious PDF — malware analysis report

Static analysis result for SHA-256 6624e91f05f5cb15…

MALICIOUS

PDF

81.2 KB Created: 2020-12-20 04:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a397f6ef3f5fe9027669c96996e3a685 SHA-1: 99bcc1e455af011e1d6e52895bc2a177a9cdc314 SHA-256: 6624e91f05f5cb15faac6eb7ffa6c5bf7a9c369fdb996620145c887d24888da9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file, masquerading as a Duke basketball schedule, exhibits characteristics of a link farm or SEO spam. It contains numerous external links, many hosted on Weebly and Strikingly, pointing to other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these linked resources. No scripts were extracted, but the PDF structure itself is weaponized for link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?utm_term=duke+basketball+schedule+2019-20 PDF link annotation
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/9857360.pdfIn PDF document text
    • https://bivupiduxod.weebly.com/uploads/1/3/4/6/134664268/nadizexatab-fativifepave.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/xomibexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd257e1f0919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fa0c7335ba88.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/1766028.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/5cc92e42-aa70-4352-a2dc-6f15df877926/xudebemugajerati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14460e7-2caf-4873-916b-ad2fc3f97d9d/metro_coffee_casper_wy_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d18db6-4d5c-4c61-a6f4-f906fd0bac58/xugulufilezevugoviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424577af-2f88-4b6e-ab00-a82b77d768fa/senior_capstone_project_topic_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e50613-c4b5-4cbf-9b9b-9dfb4fb6e0aa/kupokukawutovapegorab.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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 5264 bytes
SHA-256: 589837f9f39f0c523bbb9c4ce1b952203038a68517eb0e949d7463dabd6ef8de
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 14424 bytes
SHA-256: 956eb19ddfbb9fb9d28068fadf52660b1e99693ac08d46b2a4d51e553cc0b4a5
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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