Malicious PDF — malware analysis report

Static analysis result for SHA-256 da15c178c638b08a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 12:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7d0fcf65412f2fe7977a31695914914 SHA-1: 00ab38436b05799af03d5b126ebd1f76fceae71f SHA-256: da15c178c638b08acc58feb61067fefbd956e85555339f8fc5a3005b575e305e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to suspicious domains, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://moje-stranky.eu/userfiles/file/58877355455.pdf In PDF document text
    • http://orderkai.com/uploads/files/kagitaxesaze.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///77783044469.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210903064332.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210906_FB5170864DA20C76.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/dafodomamufujomu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/46241646198.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/retimoxurezokinune.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/zuviwokepumolowevunotepa.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/202196021577948.pdfIn PDF document text
    • http://tai-group.com/upload/files/78380240650.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/90170333211.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/29940930086.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/35996707011.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c665436e3b---pajorareg.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nixapilisuloribajibuw.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/wulaveniniwutakudib.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/39137827464.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/43351996936.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613665314be24---7537169142.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/wolajuwipovenuvo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/21228745560.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/dugujufuwozanageto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kode+legend+of+speedPDF 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_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 10212 bytes
SHA-256: 04adb7ffa05f9cc549582f745745dd4cb683500cc4342f5c84112008669b4ea9
font_01_sfnt_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 16776 bytes
SHA-256: 080716aad34ce74f54615f215f99d9c0d30e39ec563dbe7fd7b1d4e9e2114572
font_02_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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