Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41a69793d5777f3…

MALICIOUS

PDF

67.7 KB Created: 2021-10-03 20:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3e3116c381c1f0c7840e393f6c8cbf7 SHA-1: 03c3537f0ef5d5135ed106482fcf4bf52566ee99 SHA-256: a41a69793d5777f3c8ea6c9c24a837c328b02485538fd440aefcbcc145e6c602
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm and a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are themselves suspicious and likely serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=ghost+ship+2002 PDF link annotation
    • http://quaisetoiles.fr/img_pages/file/6587892873.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/lobapufizonugalolapemeg.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/junivefu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/zadiwifafefipigapet.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/94565605537.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/tulevitogerirojogab.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/76858957289.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/76860014842.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161496b243dc0d---80044610249.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/sasot.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/23477213298.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/46686290715.pdfIn PDF document text
    • http://timebymtm.com/upload/files/sugefedovudazipijimoripo.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/50398271198.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/zetiku.pdfIn PDF document text
    • http://imi.vc/upload/files/88134239399.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/tokitofube.pdfIn PDF document text
    • http://airzo.net/userData/board/file/vubofozezibo.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/gonomiwobarunizezixinugi.pdfIn PDF document text
    • https://tdfstore.it/file/liwad.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091910470373499.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/55828972141.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b6d9e10c---70780172015.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/43645854469.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_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 10084 bytes
SHA-256: 0a2e2a779e783acbf659aef1b6bc4b5e0c39ed5893451498b09286ed2c618595
font_01_sfnt_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 14356 bytes
SHA-256: d7c0019e35b87f8b76a8278fae977bd2b86b9a67c5a567c385eb1b4477ca4927
font_02_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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