Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46b99ac26e15e23…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bac4d013c6483eba706403692e082920 SHA-1: 5ae2d2a24cabf1e33f52df5e3a9fe84d75daa9c7 SHA-256: b46b99ac26e15e233adee726aae8478b26db587637cf27ca6620272983935f75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://maintogelonline.bet/contents/files/26229995664.pdf In PDF document text
    • https://ms02bet.com/contents/files/gajalari.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/tukowuwumufonabem.pdfIn PDF document text
    • http://clerus.hu/files/file/82164553025.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/78734756188.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cb8564e24fce4eb4730d4d024d37a873/sobikegel.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/fifezovig.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090220294125.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/vikowibegotuta.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/40514126151.pdfIn PDF document text
    • http://isgsrl.it/images/file/rusilutukumikuwe.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/vebuvogokukunalukozexol.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/50389634314.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/30008967673.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/woduloxagenotu.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/kowebok.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631607069betef.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wajapuwujurazivinu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6ff158f---10494591207.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/ginok.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mewomixuwe.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/1369740246.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/lujizojuvexet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=counter+strike+apk+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_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 18576 bytes
SHA-256: 82fc9dd75d29ae177266cc1f43cbcb22da5dcb26f7de2920a2b803ac56515531
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 10560 bytes
SHA-256: 9d3a631899ce5e9a49e94dcab62c875ce4d501ca146d21abeff4021a773278dc

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