Malicious PDF — malware analysis report

Static analysis result for SHA-256 241572ea20a546ce…

MALICIOUS

PDF

74.5 KB Created: 2020-12-26 09:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 61376d499df1d495f4807a10c8e879f6 SHA-1: 95bac9f1bfe133af25fa7490aa55d13615b77430 SHA-256: 241572ea20a546cea891be7c580c53ab324cdb05ca3f6b91008f996ebfa39c9b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=audio+recorder+software+android PDF link annotation
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/sosoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f990f0939b23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491936/normal_5fe11536c2650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fa9e132b5305.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/2c41ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fda3dc052ede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5fcef67793863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fcb539687e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcb369032bd8.pdfIn PDF document text
    • https://zugufanebuloko.weebly.com/uploads/1/3/4/0/134016669/kezobuvozotive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_5fa7d25117c04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/gen_1_pokemon_tm.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/47588967225.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5064 bytes
SHA-256: 1b94cf9d10c22e7d53c1c4d879201d7eef31c8f9c3b6f2bf45ca9af6979c6bfa
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10692 bytes
SHA-256: f5bac5edb121b3425fa1c343fcfc41cadba1c66f5b657250c31dd5f10b5dbf5d

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