Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fe6585a84c87ad…

MALICIOUS

PDF

69.5 KB Created: 2021-02-21 12:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 26d31df88ced87717f0e07109f7f46ae SHA-1: cf65635424ad7f087bc3520c715d9e5224d408b6 SHA-256: b1fe6585a84c87ad208dce4d5ad2eeb55ff0ec992c6e7a3d7ef6c4b84b0c6d78
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains flagged as disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=comparatif+et+superlatif+fran%25C3%25A7ais+exercices+fle PDF link annotation
    • http://zdorovie-vashe-vse.xyz/ds_lite_user_manualrva0h.pdfIn PDF document text
    • http://creditactive.info/tomefopewivl2ynd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5fe985a770280.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5fdf3a22dc14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_600ac792c072c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_600c68f2dd6fb.pdfIn PDF document text
    • http://tlgfree.xyz/unpunctuated_paragraph_with_answersnndrq.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/wujenitazujoxajit.pdfIn PDF document text
    • http://hookup154.fun/25929068803ubgql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602231a058e4f.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/gj2ifgj/best_nigerian_praise_and_worship_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/4hiPjgC/first_grade_math_worksheets_mixed_addition_and_subtraction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_60304d4d15c74.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/iWidl9h/infinite_flight_flight_simulator_android_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_601b7f5a6534d.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/ibIyheJ/61173597983.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/tujeviwakirawu/cardboard_sheet_images.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 5316 bytes
SHA-256: 7c3faf65db34832b5c2502349054e7203be935b3c73337cad6b0d245b0c798f3
font_01_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 11272 bytes
SHA-256: aed678d202a059aa1050742ff078ff06669f1942997070c485e59eed8b45ac09

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