Malicious PDF — malware analysis report

Static analysis result for SHA-256 19adf1d9a623cd24…

MALICIOUS

PDF

72.0 KB Created: 2021-02-26 15:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dfc8bed2d4f74b7272ef5ab90af3baec SHA-1: 70e64488623314e3a655bd5d349ad242b55fdb7c SHA-256: 19adf1d9a623cd247fd1df70f99afc6c8283b96392313ef7b0f19b10e570d84a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary suspicious URL being https://maypoin.ru/strik. The document's structure and the high number of external links suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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://maypoin.ru/strik?utm_term=what+is+capital+budgeting+in+financial+management PDF link annotation
    • https://pevarigemi.weebly.com/uploads/1/3/5/3/135303959/5507554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_601a63312934f.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/why_isnt_my_nordictrack_treadmill_working.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/vishnu_sahasranama_stotram_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_601d07a86d22f.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/3._what_is_the_central_theme_of_the_poem_the_road_not_taken.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/parabody_350_workout_chart.pdfIn PDF document text
    • https://pabedimulexi.weebly.com/uploads/1/3/1/6/131606760/guvedefugirabakovoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_60131ee22dbd9.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/jenubutifaxugetev.pdfIn PDF document text
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/xebidixet.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/can_you_use_the_arctis_pro_wireless_on_xbox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawirir.atwebpages.com/how_much_does_a_minn_kota_terrova_weigh.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/damituzerodekamaxo.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/83817082988.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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 5624 bytes
SHA-256: aec8e719f9eb77db2d6a383ad9159cd6f66307c9264113045fc1cf6883c31478
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 9860 bytes
SHA-256: 4f962942e39519f33ba7af6c3621b57a6d92c95628798e4a11dd2ff172931194

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