Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc7d42eab5ddc01…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 17:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01bf27bf629893ff57a7ecdaab0ee494 SHA-1: 7d43ff815360967375a802bab21be5053cf97489 SHA-256: dfc7d42eab5ddc012d2643d888254bdfc206b4da48a8a8e3b941d492e32b8cdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.centralperdana.com/file/kukosire.pdf In PDF document text
    • http://mhzsolutionz.com/userfiles/file/90463582417.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/74354461091.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/27712605557.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/refofuvemo.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/binowameruvuvanomupiru.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/nunodazuvexexu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/33003427132.pdfIn PDF document text
    • http://euroialinsol.ro/userfiles/file/78845361246.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/goduzugitasifewubeve.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/29836386193.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/xajerulajopesaweturanor.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/fevozixumidi.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jugofokusutogoxatoragibi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41c82e84c7dcf75168d0c4664b6fbf74/jasivezop.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bifaxojizanokal.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/35167664314.pdfIn PDF document text
    • http://fitviewer.info/files/file/suwerakemeka.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/jibanakesu.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/9694367177.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/98151854567.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/varugol.pdfIn PDF document text
    • http://pi-consulting.ch/download/92579887800.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6f5baea6ea517188d8f97f1a7b11f6a2/buwalot.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/jiked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=biochemistry+concepts+and+connections+appling+pdfPDF 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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 11236 bytes
SHA-256: a51ca657cc240abdba8ddadcbbd4e0be8978bce3def098dc1c2d73397a69679c
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16500 bytes
SHA-256: 64ecb60db8b6b179bfc6e37fd5ea7a37867753946a7fa237d28db5efd3b20943