Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ebd5abec11a423…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 12:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b32ffeac85c761dc1bb47269a1f60d0c SHA-1: 3470cd7379b978022645df66b18852e3af60e3ae SHA-256: 09ebd5abec11a4231fbfd16530e9462d797c900b8d890ea6342e5f7b3736b52d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, with high confidence. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also acts as a link farm, containing numerous external URIs that likely lead to phishing or malware download sites, indicating a probable spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/45857375105.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/tikalek.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/94316585500.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/80393868222.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/19730690344.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/74214699027.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/45536090064.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/rujovezesajokoxi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/943356ac45385e5049e395b390090b6b/30503442975.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/8634336243.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xutolemi.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/xowulozapujujunorigaxuv.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/nepit.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/26209409146.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/pepesanuteduv.pdfIn PDF document text
    • http://olympusflights.com/files/files/4221551690.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d74a6580c---50693208400.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/86091453951.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/tobebaneb.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/kutefofanalakeviwisenez.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/xexegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dailymotion+downloader+app+for+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_off0000b7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16612 bytes
SHA-256: 216e6260cb6f722e9940d7520dab7551966f52277477b76c6eb188fe4c37226c
font_02_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10692 bytes
SHA-256: 9cc23c60274dbb294c1a26a0e7de0bce28ba20aba0ff9d31dd785a2d78771eca

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