Malicious PDF — malware analysis report

Static analysis result for SHA-256 136beeb57a93180e…

MALICIOUS

PDF

75.1 KB Created: 2021-02-11 14:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ed8753762e73a5258f246446556dac60 SHA-1: bdfe0738410e8f8bce97d1efc2980f36d43482b5 SHA-256: 136beeb57a93180e69825f6c296f14d82fc0e237f00f00f17adc81ba3c7a737f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://crophysi.ru/123?utm_term=vernon+county+wi+coronavirus PDF link annotation
    • http://wuxizovawolimo.22web.org/construction_tender_acceptance_letter_template.pdfIn PDF document text
    • http://copyrightreports.com/insert_a_gif_into3nbed.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/69002.pdfIn PDF document text
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/jikamozubinelik_gasazurud_gejit.pdfIn PDF document text
    • http://secureappeal.com/printable_animal_coloring_book1od8j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5fc8112183ace.pdfIn PDF document text
    • http://probnik1313.tech/jifimefagivrea8.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/5086773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378606/normal_5ff43915207ec.pdfIn PDF document text
    • http://rastet-malysh.ru/castle_crashers_remastered_level_256_glitch6omsf.pdfIn PDF document text
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/nesavegowopun-vonidimasizajit.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/zupitesifox.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/xitemotu.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/3650270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegowijuvu.epizy.com/high_school_report_sample.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/28573354978.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/inner_product_bilinear_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/29497523587.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/also_sprach_zarathustra_sheet_music_trumpet.pdfIn PDF document text
    • http://lepoxas.rf.gd/baravo.pdfIn PDF document text
    • http://supisaminuwon.rf.gd/baxejit.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/dujekusagibuza.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 4980 bytes
SHA-256: 6e4f5660992cf28135cf2dafb5e486777475e8bdeba7208fcb340958edd3afb7
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 11936 bytes
SHA-256: 79e0d316b1f0faad55d20512413644be369d65dd9d25835db7594145291a9d70

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