Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b606003e5821d77…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 11:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09f33d551de65e1437d2a1514f306af6 SHA-1: d176c4bae4b997554c5df6fa991a69901993bd1a SHA-256: 9b606003e5821d7780b5cf790a313ac4ae7c824dc3fcdd9d3de56abcd34be12c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing lure, likely using embedded JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vetcarefoundation.org/userfiles/file/begilijonebulapumi.pdf In PDF document text
    • http://feminella.ro/upload/fck/jepulotojudemav.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/74606647438.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/2557800431.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/femefozibopejemuganuvuju.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/nowopikubexawikovodivu.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/vuwamigapaxituj.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magogelawikabuwi.pdfIn PDF document text
    • https://e-room.co/userfiles/file/senifolexude.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/22666871443.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vanowowunepovenox.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/ruwixis.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c078449c0---843363189.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/36926740995.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134162f644c2---43244721352.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/legozezomujexetafiwer.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/812967408.pdfIn PDF document text
    • https://asiapharma.la/files/files/ponetidugetowidu.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/60771861197.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/77283417936.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xatojusufi.pdfIn PDF document text
    • http://dakmet.pl/upload/58978946285.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/pepuwufugiragorepen.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67825995531.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/89146306121.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/poposekoxodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+password+in+play+storePDF 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_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 18148 bytes
SHA-256: 2cd6c5ca2e86ac73e11909956c24873c30a11ea8baed7834433422c7b3b15fd6
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 10984 bytes
SHA-256: f71882c09a5635ed513803c6e21028b18c04a695578ae65f31a46b2291754ea2