Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd4906b21c4e838…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 08:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9cedbcc3d202a6ba1491c1058eeeb6b4 SHA-1: eb9f10905b993c18194ef50595f234b3b743f209 SHA-256: 8fd4906b21c4e838483e00ed7b30cc6461795dfe4f2481ec14914dcee4a72a8b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains, indicating a link farm or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly suggest a malicious intent, likely to distribute further malware or conduct phishing. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kraemer-duennebacke.de/files/file/pitubonabaxufiboramatap.pdf In PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/92743136991.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/79867262207.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/14755758871.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fd20bc11---jimevogimafavofolagesobiw.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/lixuvixuratosegezosod.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/89589475978.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zevigori.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/ditujog.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/89949605878.pdfIn PDF document text
    • https://cet.sk/res/file/10841807416.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/81503849550.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/pedasibor.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/9082193935.pdfIn PDF document text
    • http://asustainable.com/global/file/waxodipuzupofid.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/diludodudap.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/42369492638.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/ratatowerigadesenurito.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/nijuvitezuluvukupux.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/pujofapenulixinesalaneb.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/lusitufel.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/88414421380.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/49649353502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=born+to+be+bound+read+onlinePDF 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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 18084 bytes
SHA-256: ea01571d5302aafdeb89fec5877b30c36e3ccc539013b96943713125227e2e99
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 10368 bytes
SHA-256: 0751bc60be1801acd61cd3602bbb0f70d0cdd94e241aa0cb65d4ae959734f353
font_02_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1