Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b63e24c1cd1de2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 01:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c76c5954cc71ac8da832e4e2daae729 SHA-1: 6d4a4786910f86b1afbea96e8ee61d9a8230c8c7 SHA-256: f5b63e24c1cd1de26052ca51ad4d73566369f1c9dc8a21a6d3daadf4d04cb49e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dalilak1.com/userfiles/file/wudawexuzobisatavebot.pdf In PDF document text
    • http://avvolodin.ru/upload/file/bimujasatalaz.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/jirowevejiwojajin.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/kufogorolilusozepugivenuf.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/67124583955.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/zapud.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/62196993051.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lovojuzokajujogiw.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/witojajelititego.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/69963163293.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/jovoxopovikapebanipired.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/41943704955.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/lutopixoximuk.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/82997949112.pdfIn PDF document text
    • http://3sdent.com/upload/files/80194301989.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/98892653511.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/fiwevavometupizabiluxilif.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/todozutevadidijudo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/59822707503.pdfIn PDF document text
    • https://o-dance.com/upload/files/9984987514.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/24487193980.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/miribomin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+fortnite+v+bucks+freePDF link annotation
    • 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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 10780 bytes
SHA-256: 886cbd7293ebaeda0fccd9614ae78373147f1b7b6ebe60c7403157b0c24f85aa
font_01_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 17808 bytes
SHA-256: 59ae890bf89cfd13e4ef8c260ea669f5911c0b3997823b998dc9b94860c1713e
font_02_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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