Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a38f86051a47cf…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 22:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db092c5c8f30d76519bccf092c1a0865 SHA-1: 9dab24fb0301e66c8b039df37735aa47e081264e SHA-256: e4a38f86051a47cf73cfd10c17867f41885b3636600d0a71addb7343fad575d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.cascatai.com.br/ckfinder/userfiles/files/titanemopojubelenalego.pdf In PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/59257662107.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/puposiwovezir.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/8406059063.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/43522072794.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/70165127378.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/rotomuniko.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161400a64a28e4---95834085521.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/91109743189.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/15317713935.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/09ea5e7f7cc0c6eeb5bf3acad792ae66/fusepemokala.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/28725602894.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/zinitizapunitorupezekam.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/tezeladuxulurinenowowalin.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/zanevol.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/kikuwe.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/tokagukixikafamalabemab.pdfIn PDF document text
    • http://yoron.net/up/files/68038955106.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/nurunavunatuxozoxilikusaj.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/38282423573.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/panikidokemexonakosuka.pdfIn PDF document text
    • https://hale-metalice.com/images/userfiles/keliwel.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/kinegaze.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/18926752498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+beetv+on+androidPDF 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_off0000aebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 10364 bytes
SHA-256: 6cb28f51f9c1f778181f508d83fe4078cbb1bd13429aaace9dea2d7b998cccbe
font_02_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 15984 bytes
SHA-256: 4139ba4c08643790e3aace8f185c58c97bffadd8e4d7d6304f438b120b863683