Malicious PDF — malware analysis report

Static analysis result for SHA-256 521d754915ae6010…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 09:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 600c89e44524a8fcb2578fbd76970fe7 SHA-1: f2ce09ec78f8fa4dee51bd0af28acaa7efeaf6a4 SHA-256: 521d754915ae601057770bda3de59edaa0a151f0d30d5204e0e0aec2639ff3f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The primary URL suggests a lure for movie downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=a+quiet+place+part+2+full+movie+hd+download
    • http://farmaciafoglia.eu/userfiles/files/54935580992.pdf
    • https://pharma-tools.pl/galeria/file/82273149856.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161315c72d0cc6---2612193098.pdf
    • https://cliniquemyo.com/userfiles/file/nuvibi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/db7557de30d47bc8d4f67017f89c4ac7/modet.pdf
    • https://guanlai.tw/uploads/files/202109091658442233.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumolaka.pdf
    • https://piti.leaddeehub.com/userfiles/files/rulafenitilenumogu.pdf
    • http://www.findvoters.com/userfiles/file/negaxabo.pdf
    • https://boyanbolyarski.com/userfiles/file/losaj.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/57665736171.pdf
    • https://jatransfer.com/userfiles/file/zusizipul.pdf
    • https://e-uchebnici.com/img/file/zurogegajabusokozizot.pdf
    • https://nutrishop.in/ci/userfiles/files/24248585039.pdf
    • http://wamer.org/userfiles/file/fisosapafimop.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109130643226781.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/51068783299.pdf
    • http://ryanoomen.nl/uploadimages/files/6029881157.pdf
    • http://studiochiodo.eu/userfiles/files/pajijaroso.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/26795527150.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/10891090788.pdf
    • http://nakloboucku.cz/uploaded/file/xufonupato.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/4272622400.pdf
    • https://dehayemek.net/upload/ckfinder/files/kufodapagobitoropujefije.pdf
    • http://eros-arena.de/eros/userfiles/file/40928470913.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/6254459282.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 16792 bytes
font_01_sfnt_off0000d112.bin
d6466c8fb894ee3ae3848355c2ae4bea01e787eee6d80302ff9c3c1c8ce95d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 11216 bytes
font_02_sfnt_off0000eb08.bin
e7c7a253d66abe45e9143fc1502f95ab3c9418344b0e199973b5ab481035034d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 16240 bytes

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