Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1bfd83b4fd4bd6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 19:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f14866c813726468b9c9e9e8f468f08 SHA-1: fc4aba2c7b4314c5e2060452a422dbe112b4ff44 SHA-256: 4f1bfd83b4fd4bd68997ee4adc6293c801a065ce7d103d1faec4a35b0feb42de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing site or malware download server. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://itena.si/uporabnik/file/64198443430.pdf In PDF document text
    • https://xyoaa.org/sites/default/files/files/voratuzataj.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/56767671146.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/7418548689.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161330418268fb---roxosumilelutetewu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/42750389286.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/xakelefusazegagu.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/lanukakowe.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/2831001759.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/71360118913.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/basej.pdfIn PDF document text
    • http://emaaravm.net/upload/files/43118895905.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/dupamadu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tuxaje.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kafobef.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/sopug.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/38812206767.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ab34893e53d568851d5abf1bd945e751/begobanimokowit.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/2324983444.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/49034451024.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/69958185924.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/78383268320.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vafugivifuxexukofifakef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+i+use+siri+on+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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 18436 bytes
SHA-256: e696cc0880601036b70ae10ca6de1db94b0a4cfb402a64e2fc86158b56d76f96
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 10228 bytes
SHA-256: c80606985bad6674a5714993b0ef3f7003bb075b2c19d5ae7f32b27c59c9d964
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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