Malicious PDF — malware analysis report

Static analysis result for SHA-256 6408311e5cd26f33…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 22:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4ae91d0c827b48a0386f1f012ea8e6d0 SHA-1: 8e57239a280cb424c73c4df6e40ff0b6bece53f3 SHA-256: 6408311e5cd26f33a71c70f74021e120a09ddfd8ec38adcdc948ae6f88b778be
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 0.9974

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://huucodatlanh.com/userfiles/file/gapokanevosilabimofefe.pdf In PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/bupelele.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/polefu.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nogekimezaxewamiralufetu.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/jademolowurozopufaw.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/tetexogunazofafojej.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/51636991109.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nabugujamuwupajerarab.pdfIn PDF document text
    • http://iscelenie.info/files/file/97207628968.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/lepirikisof.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/midanuxiximevov.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/57249460735.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/durebigovazisafowejojog.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/44486049562.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/gagagiwigo.pdfIn PDF document text
    • https://vpmemorial.net/images/file/somawijenugovesiku.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/70329057768.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/500e05e5fd32c29c7887773a6ff529d5/vatapujojegomonogodanogi.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/dejokogajinulude.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jawimijutigirodijuka.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/ginerebenow.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/67066924417.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/54996840111.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/97867802622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=domino+game+apkPDF 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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 18828 bytes
SHA-256: 319c6598d77cd51a30438f071d7ab044b7f607acdab8263bde83c2b313345c11
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10276 bytes
SHA-256: 9234a0ff9b4d13fd2f8857e080a83fd9bedebe4cba29ee63ac92f6b1dd81e5be

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