Malicious PDF — malware analysis report

Static analysis result for SHA-256 28098b152c7de452…

MALICIOUS

PDF

68.6 KB Created: 2021-02-22 12:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 460923442b92830a643b291ceef3893f SHA-1: 249caa4aaaf772fe943b8ebfa20b38aa2fd54acb SHA-256: 28098b152c7de452c461afbfd55cf875351ff018b997a86dc5825725ff730859
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a redirector for a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=us+craftmaster+water+heater+lighting+instructions PDF link annotation
    • http://mjawebdesign.net/city_bus_simulator_craft_product_activation_keyjbsfu.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/important_synonyms.pdfIn PDF document text
    • http://tuwedoviwe.iblogger.org/cyber_security_course_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_601e82e07a6bf.pdfIn PDF document text
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/gapudoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5fcdd53aa8b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_600b388c0298e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_5fdb9b8e7bcaf.pdfIn PDF document text
    • http://todayshop.website/7045815313755tz4.pdfIn PDF document text
    • http://febanadedej.22web.org/4x12_lean_to_shed_plans_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fce3e996c1ea.pdfIn PDF document text
    • http://itravelgr.com/4451306561k0132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_602a9ceea6ba4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383918/normal_5ffe018f4ca22.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/vezumobigodub/18748958155.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/dazujokewimenafuwezenu.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_off0000cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 5380 bytes
SHA-256: 58455acb36db7d71ce22bc7a8e3e785a9833cefcc871943811e8a00bde701da7
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 11084 bytes
SHA-256: 5a59ae0225e014029b06577a2ff757e8ee2efd756fb0f3f29d66ad4a90320c56

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