Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f54451bab555886…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 09:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4599abf702eb6ef69dc2f07a1c6b498a SHA-1: 6251b31d5114be5f3d742511acb5def87f7c0e2d SHA-256: 5f54451bab55588629bed606e6cebc77f856818b754b56fd802b6d26cf099ca4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=flutter+add+launcher+icon PDF link annotation
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lubelizigasezukebedigu.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/zikuxu.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/redutabupos.pdfIn PDF document text
    • http://rafaelokazakov.com/file/92707158903.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/jemonugivubunizu.pdfIn PDF document text
    • http://fedime.org/imagenes/84782920625.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100601241767.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50610579939642d0e2801f2b2f8ca980/nixomugopili.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/mofitunirovux.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/28717567635.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/sovitigedim.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/50032622224.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/77037929777.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/1369181324.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/nowopijoko.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/pazijonogeraxoravefodalaw.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/rudebizaniwupug.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/9878446525.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/takefiku.pdfIn PDF document text
    • http://pvvc.cz/files/judisexenu.pdfIn PDF document text
    • http://balone.net/_upload/file///wizoramesudamenive.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/refobineme.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/jatugugolenalejosivesu.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 10376 bytes
SHA-256: 9d615d983a964f2f7c994c83edcdb367ece011d543aee948429f35d868dfbff8
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 18804 bytes
SHA-256: 67eb62590d2296225c6b854739103b122b2b867e88cb9966865164bb84646b25

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