Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b33ce484144d170…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 14:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17a1b1da51ebbd35b75e49de5e9bcfec SHA-1: 976ddb689a46e87cb19b3e1468b32af3172b3a0c SHA-256: 8b33ce484144d1700bccefc129ee55eb21aa88c49e7b24eaf9b355799c74a378
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing attempt. It contains numerous embedded URLs, including one that appears to be a redirector for a fake book download lure. The PDF structure and the presence of multiple disposable links suggest a link farm designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=harry+potter+illustrated+edition+pdf+free+download PDF link annotation
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/85557883026.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/redumovidokozetevuji.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/paburejenonuxomolijox.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/wovorizawapote.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa774d72dd---wafesotifadaweverewib.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/gokexas.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/geguxa.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/mojakoga.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/76975241369.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/zaxubesijunafawugezuwuko.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/toganisum.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/18640538301.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/xofewopom.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kenufazakimagujawubo.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/45105401055.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/zagurovapezudotopejamez.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/77579867420.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/78607819354.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/83229197723.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/94393009220.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/51732347763.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/95526948103.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/94668716291.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/34695501813.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/78966122745.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10784 bytes
SHA-256: 53b859643cdcdd8cabe373c19a68143ad7077df8fc0712561b9abfdd76776c13
font_02_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16424 bytes
SHA-256: 8330864cb1b98de2c7b84310f4aefb7d8a2b5c9e73271eb353f9ce00be944ed4

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