Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b19695f6a7d22bb…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 11:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d812f298618751a5ba7441f078ff9001 SHA-1: ae844fc42cdaa709e123dd46e3701e3668daebca SHA-256: 4b19695f6a7d22bbead798bb7eb2dc12c1330f320ff5e9547235d69a817e6c77
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to external websites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gimoguvi.ru/123?utm_term=curso+tecnologia+da+informa%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • http://gosoxegekiri.mywebcommunity.org/dusukejewibevagugimisilug.pdfIn PDF document text
    • http://timinome.getenjoyment.net/bauchspeicheldrsenentzndung_ernhrung.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_6057c56bbb460.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/4Hif0je/download_offroad_cargo_mod_apk_versi_terbaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_604ccdfe23de7.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/article_370_and_35a_upsc.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/ahejdhc/wuwatakapaputidixeji.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/jieij2Y/idsa_meningitis_treatment_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/hVhcUij/gigipowigerit.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/h8cwZgj/mevejewegaxiwedok.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/14899420367.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_294aa91feabb4f6bb4d7aad97cc89951.pdf?index=trueIn PDF document text
    • http://wazipegemezen.atwebpages.com/84617487666.pdfIn PDF document text
    • http://wilosokanik.myartsonline.com/atulya_bharat_book_download.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_13053cc945764728a471fb00878f7f26.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_811ba72bdf84454aa1f8d0b3cb231bb2.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_770bc4bf443a4a8a878962f99f628cc4.pdf?index=trueIn 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 5880 bytes
SHA-256: ee5643af6561d103cb0d25d13ebd73a8a7a842ec8a53aa423236a8859cbaaf88
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 13212 bytes
SHA-256: 5c345d33e7cdfbd64a096fac34de335cdca5a93f8cec7e03d0c111828463e87e

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