Malicious PDF — malware analysis report

Static analysis result for SHA-256 12967ca1fff8ec1d…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 04:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46e7406ac7de010be8ad82e21a17c169 SHA-1: 98c8811d6e335e53045d55ebad04c288d23b8bf7 SHA-256: 12967ca1fff8ec1d09bdae82679febae1e39ebb68a7ec047096dc4625bed92b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many of which point to PDF files on disposable hosting, suggests this PDF is designed to lure users into downloading further malicious content or engaging in a phishing scheme. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://krisoc.ru/uplcv?utm_term=email+template+to+send+resume+and+cover+letter PDF link annotation
    • http://joy05.com/_UploadFile/Images/file/37789388075.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/negazu.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050201157907.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/jebime.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tepegowolisubemasusir.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/31690953523.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f92ddef1---pakojokaxefarisel.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/430373471.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/zejujuwowerobubutibo.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/jimafowomufakugej.pdfIn PDF document text
    • https://trainova.com/userfiles/file/84125436517.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/pekenuwefinudanus.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/56865146031.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/puponagolilamaku.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/35749062178.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/35073816024.pdfIn PDF document text
    • http://redactron.com/userfiles/file/10488690746.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ae19fab8ab20ae74f438ef4edf453a0a/zazada.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/tologasakewitasipafaz.pdfIn PDF document text
    • https://motoralbini.it/files/file/12222045035.pdfIn PDF document text
    • http://opersan.com/file/mawinikavapuxu.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/53063318250.pdfIn PDF document text
    • 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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10824 bytes
SHA-256: 8548ee56de4c3eb9bca9dd842455deb69a044dc584e05566455a08c584b75a5a
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 18528 bytes
SHA-256: 305fa4c744ed841cdc63502545bb050b5e2bed41426e524128191e6fe95580e6

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