Malicious PDF — malware analysis report

Static analysis result for SHA-256 f988ee8fcc08eb21…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 09:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e60c2fe693dcacd6929e27e06ce0ccf5 SHA-1: 2da1b4b94d87829ba9ee96ad5881e1b0c126cac6 SHA-256: f988ee8fcc08eb218e67e7e1101f0b9a5b4e5956e1ec6b8da048e6b76bdf6124
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to other PDF files, suggesting it acts as a lure or redirector. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://rydelko.eu/userfiles/file/muradaxajelipijuletig.pdf In PDF document text
    • https://aldurra.ly/images-editeur/img/file/50489058251.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/65447598885.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/49868621227.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/tisonesu.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90687139327.pdfIn PDF document text
    • http://proxima-online.it/public/file/22669447355.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/9867847312.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/garubujegiriwitoxoveja.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/jutas.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/95033256560.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/sakepobejokamazufevevat.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/90593793191.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/68959335240.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7a5a5c598---sifedatomibuvexutiw.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/soberedunowib.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/pulojimitirabibaga.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/9038014764.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/38962816831.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/31354247626.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/xodigavofigodakinigefeb.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/janujosetetu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/56cf0629aea97555df5976d2d9aa8399/23747639263.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sadoledizejogora.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/moboxorovijimeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=i9100+repair+firmwarePDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 10364 bytes
SHA-256: 4ac530791706eabf9779ca617a3479d9faff090a693571b9730d80a90c329c0c
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 17392 bytes
SHA-256: 9a183fd89212ef9eb9864ff78c54343a5fa238b99c18d00f340de92c1eff4b6a
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1