Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bb497668c9b235…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 12:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10bdb947300317d3969c2354acd27df9 SHA-1: e8caacd6508593e750b82179becb8374c160963b SHA-256: d6bb497668c9b23531f674d2baff9acbf389f7869684adea85428361ad0f7533
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 link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript points to an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=android+reboot+app
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8638697bfc35e525cb8ed2b6bcc07612/gusavadoguvotivokova.pdf
    • http://mnarch.it/userfiles/files/9538063554.pdf
    • http://allier.proximeo.com/ckfinder/userfiles/files/ruworixukajomikusupilodu.pdf
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/70601677975.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/wumobasemaratejijemapozem.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/24902713269.pdf
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/pososajojimutawizadupa.pdf
    • http://unicorn-furnitures.com/d/files/goniroxexitanumejavunod.pdf
    • https://dukra.sk/editor_uploads/files/zimewitenewabusus.pdf
    • http://pwmtqatar.net/userfiles/file/wobufixuposipigefa.pdf
    • http://savemaxint.com/files/file/xemowarizaxeriguvotan.pdf
    • http://elisa5888.com/shopadmin/upload/files/6367824945.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613127e77db8c---75946565905.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/kubetupu.pdf
    • https://hyosungulf.com/uploads/file/449032972.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/91689992179.pdf
    • http://dvif.fr/userfiles/file/levesevevidikekizir.pdf
    • https://holcom-wd.com/webroot/img/files/lomijopufed.pdf
    • http://giasuminhtam.com/Images_upload/files/kixonipugezoveni.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/dukigabolipufavopexujev.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/21550763663.pdf
    • http://sethhukumchandschool.com/userfiles/file/vivotodedadetuzedelus.pdf
    • http://nbc.ua/design/pic/file/loverosugupugipikakakaf.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_off0000e897.bin
010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 18056 bytes
font_01_sfnt_off00011776.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 16792 bytes
font_02_sfnt_off00012f8d.bin
31c9b40d3eec8c6ec19e5955d31efc7be389d69cc8374cf9b722d446a9d55404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 10292 bytes

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