Malicious PDF — malware analysis report

Static analysis result for SHA-256 c469bf626563f401…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 14:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82792df4ae16e8a997d5c30d744b89ce SHA-1: 2492d29b01102a9f77fca583f4d0e215286794a7 SHA-256: c469bf626563f401561fe4271c10c01620c6ac8467da014a411f6c47ef2e46ff
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=what+does+nfc PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/eqhd3i6ukbobhaahsrig9lssu4/dagemilarafavunifova.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/48552575424.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109040836071024.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/7821e5cd6816f0eb58716f09e8f2c6da/kuganefixera.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/58252276356.pdfIn PDF document text
    • http://turnyras.lt/Files/file/futujagulepinuzapan.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/terijepakofajib.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131400081183.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/zipudemu.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/26652469873.pdfIn PDF document text
    • https://terracell.info/images/file/bafekad.pdfIn PDF document text
    • http://baove24h.org/upload/files/mifunisevowipifigibuvabuz.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/32663569720.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/37062636828.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/limidebufiwex.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zusikujefadilefefejipubo.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/jazerimipuzari.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/81225492649.pdfIn PDF document text
    • http://pi-consulting.ch/download/39680186316.pdfIn PDF document text
    • http://zzquansu.cn/d/files/pemuxemirofelogete.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wewitibamijukofololubo.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/95526948103.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/25838472462.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/46880209572.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/sivomajomuw.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dufunatenuxutizubizaj.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/63160195088.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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 17304 bytes
SHA-256: f595e1fab8ab95aae8d124db75b89bd73f895c9c219ba762d97b23c9e6e803e7
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 10328 bytes
SHA-256: 30eded821a4420062153f71ebbe6f5f497d43d0aa7d4578aa1b3f82b7a586be1