Malicious PDF — malware analysis report

Static analysis result for SHA-256 72da76b5c4cbc64a…

MALICIOUS

PDF

67.5 KB Created: 2020-11-13 21:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 49c21dab4a3bdba8cf6f2f6279e0338e SHA-1: bdacaa7a712ec798637bbf11d92d839052b5e4dd SHA-256: 72da76b5c4cbc64aab15587d2fc66bdb981ac6c726fe35cc203111dab85ef942
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, identified as a 'PDF link farm', suggesting a phishing or malicious redirection attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://trafffe.ru/strik?utm_term=earth+day+coloring+pages PDF link annotation
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/tuxazavubabezodujizi.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/b1aa97ebdf83b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f96e0cd16f0e.pdfIn PDF document text
    • https://jalekusurasi.weebly.com/uploads/1/3/4/3/134392531/xivubaralon_folilufatutal.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/katake-wafezej-pilofuwivuv-lugopurigovepe.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/damologitasipu.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/7e8b6f5d-d2eb-457e-9630-b6e23cb14750/safeguard_dental_insurance_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f8099e-ff8e-479a-bbb0-6a105cea675a/54814046976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cd5dfb-0611-4c2c-923d-47dce02c8cf6/lg_oled_65e7p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c8f251-f5af-40ee-bb6f-8889fa0dcde4/xapowoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f611843-6c48-4a13-8ada-548e7ab623bd/answer_key_go_math_grade_4_chapter_12_test.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_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 5396 bytes
SHA-256: 7634a8c6bdd33f6ad29c35453647124cd08528d563a61f22f3a684b1a55fe064
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10204 bytes
SHA-256: 4d415d1b45a1dd088dab071a09f1d75452a8b721b5cb1a3578b496fe77801c86

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