Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5305e19f3495952…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 08:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 353470645e9da546b210931ecf785615 SHA-1: b3331d2954806555f84810f7c50e4c83c72d1a46 SHA-256: c5305e19f3495952544fe0f261001e0d0e10550190d3f87e25808633d6e020d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rassadaspb.com/new/files/file/tunigujisegubadafegeket.pdf In PDF document text
    • http://chretkinia.pl/userfiles/file/13054658181.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/damunaw.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/sapifilenixuteveverevumo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/dojupabobexadutezaso.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135643176c54---kowegoganix.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nogeninewetaloxika.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/85985504558.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gevutexutebifixowuvufov.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xazokukapixizuzudo.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/fuwodenegog.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/kemuxotipikirurifate.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370891e1a81---82018200701.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wedigurakawoguvisu.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/miluzemuwarupafibuvov.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/polidebivudinifa.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/darenobuvet.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/84275957724.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/lujenopa.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/61883001243.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/jijuxuvupoleboxixuna.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/bubiwozozepitek.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wajuxufogikufoxagibiso.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/dorisikokugabozuxosipud.pdfIn PDF document text
    • http://sieuthibds.net/images/files/12998725652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=paw+patrol+watch+cartoons+onlinePDF 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10560 bytes
SHA-256: f39f4ce3864b5f62dec02924945e597cb9916810174b671948df7c47e4909235
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 17572 bytes
SHA-256: f9886b74a5bb227e192d50b74a40823c4ee7b296d7378c76c556aa8c9d599fba
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1