Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4df15e54e44dab…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 04:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f77441628ce2a0bacff08e2bd743b76 SHA-1: 9265ab8f1a80783b052dd927ee4ca3e7dc8367d1 SHA-256: 1e4df15e54e44dab79f66d01d1d5fcad825f671fb195577a97bdee1b208fe9d3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social engineering tactic, specifically a browser extension/update installation lure, to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate credential theft or malware installation. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://1tlstar.com/storage/uploads/files/2704906317.pdf In PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/81940131832.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/xelezaxanerapad.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/sojezame.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/ronezepokefofi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b01ddb06f---29060913970.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/1596115945.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/konidukajunuji.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210908010831.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/bapubaxesovofaviro.pdfIn PDF document text
    • http://belniig.by/public/file/juwowumadirapezakobefifiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c99b9642e---14755746684.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/12743267557.pdfIn PDF document text
    • http://edallyshop.com/upload/files/guwalolusula.pdfIn PDF document text
    • https://noventa.cz/media/files/file/12981950911.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/futeza.pdfIn PDF document text
    • http://vodova51-53.cz/files/sobiwazuliza.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/8146296860.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/gogoribavidipakirabi.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64300236748.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/35074480120.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/33687357686.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/64200195813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=older+version+of+netflix+app+for+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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 10684 bytes
SHA-256: 20a6634e04cc8d4a1ede42b6d7331991a0061a106ed6419347da0c57dae64882
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 17392 bytes
SHA-256: d3b7c9761c5688b4fa9d16a3f28e8e4ce66dfc5224ea3219090d377b9fdc1aeb
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1