Malicious PDF — malware analysis report

Static analysis result for SHA-256 9658b460f626518e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 08:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34999ca5743c452b06e1eae266257b14 SHA-1: 1d1d4d55311cdddfeb37fe921c7db88dd80e7a82 SHA-256: 9658b460f626518e6ff583cfa71bdd44065477a0bf088169513d2893486c1217
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to PDF files on various domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anfauglir.com/images/file/ganagamoga.pdf In PDF document text
    • http://mousike.it/img_ins/files/laralirixikesotiveg.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/89777094398.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/diraloz.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/nopavaxeziduwanepufenu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/90267990549.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/13774267275.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/jefiranozoluzatoduxure.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/daxafupisumixuxe.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/riwudemifu.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/domenatubedajedepiv.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/gadawipo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/20446982477.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/33155698498.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/suwumegajisemefaja.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fffda3675---40256757855.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/wuwawakugu.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/pixuv.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/fexojakisurami.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132468f0fc31---tuzikoromavazodetore.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/nufebavomerom.pdfIn PDF document text
    • http://rivucota.com/upload/files/fisejuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=connect+android+phone+to+ipad+via+usbPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10904 bytes
SHA-256: 7ddcd5af414a827e5d0a9bbdd9d1ef7266a8a5ba8c186ab4d251a4fb2bc62966
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17620 bytes
SHA-256: f3ae1c2d338ef8946519818ac7dcc5f947c2b3f957ea714986d4942c739ea76d
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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