Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d13731594e1f046…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 20:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a66ccb3872d0d4521412f1858af50e22 SHA-1: 2d513762984fd089c0a1071df453cdd30bf03ea3 SHA-256: 4d13731594e1f0466fbd4034d2dab0f8f860e11ea2c517cfd5f7ccb659ac848d
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. A high-severity heuristic indicates it uses a social-engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. While no scripts were extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites for payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://luminex.pl/upload/file/movox.pdf In PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xaguluxejuwebelukos.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/33516453748.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/xejabapededitixemew.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/74228518413.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/lepokawono.pdfIn PDF document text
    • https://e-room.co/userfiles/file/senifolexude.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/49345344817.pdfIn PDF document text
    • https://etadelloro.it/images/file/14009647423.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/madilagikoluzotefidod.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/cidaq7lg2jbtnsrm6ilfra1ppg/63064573014.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/796314361.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/23387986912.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/05231858819.pdfIn PDF document text
    • http://erictex.com/ufiles/files/julenabulosidadogakujobu.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/laxezeweni.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/68922770245.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/dexon.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/nalumutoborosogetajuniw.pdfIn PDF document text
    • http://airmon.hu/images/files/89424015094.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/7880897742.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/58082911183.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8fcc9e7a---8937892824.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/9601059762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+off+firmware+update+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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 18792 bytes
SHA-256: fab38f758c475dd73cdc479159a15c7fbe2b02a51fac19ee047afb3269fccba4
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10624 bytes
SHA-256: 73d9783ee98937d4b76aa420bff92419c3a02ee8da010ad9c8a8a9ba36617ea3
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1