Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dc1588ea5a779e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 19:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a9d63f7fd70ba947a9b119415fdccff5 SHA-1: cf917008dfe8e1e8228c5cb0e0b3402a7a91c4c8 SHA-256: c5dc1588ea5a779ef24f6d7bca7f4f48dfc48d8acf4898d573a8ff04f224063c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=marvel+pinball+apk+full PDF link annotation
    • http://s4l.vn/storage/ckfinder/files/40160561928.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/tidejuzelaz.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/825e5b24919baab267aaed585da245dd/sawonunatazepudem.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/fibiwifedid.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/kusosif.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/32420450361.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/9035423783.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pawema.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/wimuwezasipinififutavom.pdfIn PDF document text
    • https://partnermind.cz/images/files/takeman.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/diwavim.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/vapumopofigumudiregev.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/88083677248.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/jexume.pdfIn PDF document text
    • http://elitk.ru/_files/21812248477.pdfIn PDF document text
    • https://stauber.lt/images/files/pilezu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/ragifumodijawuzowigifim.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/wugiz.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/punilabog.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/lijejaporidaxiveru.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/48569088539.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140647502ba7---toxev.pdfIn PDF document text
    • https://tonitomov.com/picture/file/damopexat.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/1835202979.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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10356 bytes
SHA-256: 472bfea90b3e733c21b9c55ad145c695801a51396b97c066eb86fef506494298
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 18588 bytes
SHA-256: 5df81f95c97050e1d739b52303bdb5e308f788a7de2d0ccf78b5c2674d65f518

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