Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c827780de1126bd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 07:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82cbc5d861fd3b585cce6d76bc08bf42 SHA-1: 617444d01d1fa22b310926efcab697e36eeae918 SHA-256: 8c827780de1126bd090da6ce18f2191bcf4cbb8052da3f7c37fa559ac6777334
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to prompt the user for an action that leads to compromise. The ML classifier and ClamAV detection further support the malicious nature of this file, likely serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atsrealtyvietnam.com/upload/files/72652975319.pdf In PDF document text
    • http://immobilieninvestors.net/userfiles/file/xavukaba.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-7/20210907020438629752.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/25547602799.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/dinuletofipiga.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/46080713334.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/pixotakubesulenujetas.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/fasuxemisuvofobifa.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/fuzobuduvobozidawib.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/77198447586.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc59fe2073---98866004049.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210917_BB5FD6681AA2E5E6.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bdfb6ca5---5360359613.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2b0ad2598426d188143c057c941d6f44/39016965646.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/bokivajisibifeguwadebup.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/7613515069.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18549711055.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28858512064.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/xolevolekolalagigenoj.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/77330553831.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/42781311375.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/9847448928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+get+free+robux+without+human+verificationPDF 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_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 18484 bytes
SHA-256: b3bd9173a50204693bdad1807689bf6b5c59190d8761445a621d20ce3e9200dc
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 11308 bytes
SHA-256: 185e325318678aa58a03df7d3e00ef22329d15449ed33d285729dbaab7c92814