Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd270bcebed7f57…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 03:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53f0706e1b5e686cf680165da04c3474 SHA-1: c3db6e71bfcaa6d45aa277981334441e6c0d2146 SHA-256: 7bd270bcebed7f57cb5bc551909be05ab1f270eab2a9b0ce564aab9a309d9dde
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick the user into installing malicious software by posing as a necessary update or plugin. While no scripts were directly extracted, the presence of numerous external URLs, some pointing to PDF files on potentially disposable domains, indicates a likely distribution mechanism for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://barudan.hk/UploadFile/file/20210912133645952.pdf In PDF document text
    • https://willes-gb.com/uploads/files/202109090803214498.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/ponawin.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/46958284831.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/duxobupadejaje.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe8b48d68c172c6b97c57764fb8861/23603613032.pdfIn PDF document text
    • http://geoman.cz/data/file/61031764281.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/58971536616.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/56737083724.pdfIn PDF document text
    • https://tsegypt.com/file/pizewebijex.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/84406771504.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109051101176354.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219131310356317.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/jetoxituxip.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/48191986080.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/98843672700.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zonuwototadiwize.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/ketufunefizubob.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fetatetidupez.pdfIn PDF document text
    • https://satesayap.com/contents/files/rawer.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/fumonaminamajebefopalod.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/93445309572.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903160106195508.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/nukezokumopopixowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+reader+for+android+apk+downloadPDF 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 10404 bytes
SHA-256: ce211eb3a03dd4353c6a800924adea4183bdf7b8a86fc9a9afaa9b2c2b22f958
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 18384 bytes
SHA-256: 4749487662c0a63f14b740390ad9d614e25cef62b8b51e54edc0b9054594f2a7