Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63f735d5f13bfa6…

MALICIOUS

PDF

70.5 KB Created: 2020-12-17 03:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2cdce7609777b042911685f572b01232 SHA-1: 9810f78775395e14ecb9130d8984638f0004828d SHA-256: c63f735d5f13bfa6d5398f55d0febd7f46f70ee2bf3dbf96148f4bbec8f8d924
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on various platforms. One prominent URL, 'https://traffine.ru/strik?utm_term=dahlstrom+middle+school', suggests a potential phishing or social engineering lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

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/strik?utm_term=dahlstrom+middle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fb5b93509540.pdfIn PDF document text
    • https://lanedipeluta.weebly.com/uploads/1/3/4/6/134666686/7277779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_5fd6d08ec47a9.pdfIn PDF document text
    • https://zipufalazuviw.weebly.com/uploads/1/3/1/8/131856517/5514397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fa0489c45c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5fd80ce266934.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5fc67a1793285.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/821b143725022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f8d82a53d8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fbe6e91159bc.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/44f3fb9d-700f-4b3b-b349-ed62b4de2ddf/8693837320.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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 4860 bytes
SHA-256: a5ad5eafa4d3b1be344bdef6dc7217482d46eb13f5f01e8ced5ae24a0b57e157
font_01_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 10080 bytes
SHA-256: 18369d4f7b7342e4e02094274e0798eccbf92f4f29cf8ab103426f9dc816374f
font_02_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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