Malicious PDF — malware analysis report

Static analysis result for SHA-256 4272aaab762cc98f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 02:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 075bda2fa3f23a0f5924e6e5b4369cce SHA-1: 68e56c671439753707fd57c2232c24a2770d41e9 SHA-256: 4272aaab762cc98fad09aaa2559a75a463fbcebb329a05245f57e7459acbca2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=price+of+iphone+x+in+bd PDF link annotation
    • http://progfin.pl/userfiles/file/17905613123.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/46211163378.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/texojotikeket.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/noditumidatezaxufi.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/92809172801.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/remomikuxuga.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/96864214695.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/9543586649.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/23956225473.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/24238043652.pdfIn PDF document text
    • https://alutat.com/data/file/58845766581.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/zovexebowusowapab.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161315eb2ca1ec---fabomudogaxibaxu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/82033267836.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/bimavuwusujetip.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vibegadajir.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/tafipufegijizaba.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/mopogodijuvijakuginesu.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/37672422346.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bec77d97---dopisevojodogurumulujone.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/mujusodewazozepuwutu.pdfIn PDF document text
    • 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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 10484 bytes
SHA-256: 2de95f4010ef703e20fef3157bbe32f18af97bbd115be531b3cd0d3a98188d69
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 19240 bytes
SHA-256: d4579ea577e472708fac35b520d9e328e02464145ee035b04232c6a3ed0ad411

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