Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5de0c2d2815e4db…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 09:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 195844e4557cf7e6c77aba621c67b7c9 SHA-1: 8770ed7891598e0221ae328c9d7e3252ba8a3456 SHA-256: a5de0c2d2815e4dbeef6df30526e2b74a59e807d646bcdb28d5d6301a3d266e5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. The embedded JavaScript is likely used to facilitate this redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/xisaduzozabuwobarib.pdf
    • https://kentacademymiango.com/userfiles/file/kuvejeguzanosoga.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/95468942806.pdf
    • http://thegoshow.net/userfiles/file/gebisusop.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/saxopiranisuritisidajerat.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140807c26107---48448760725.pdf
    • https://bleikss.com/userfiles/file/kavobiji.pdf
    • https://saikekanglun.com/filespath/files/20210910105134.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/35078033333.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/dawafivekanamu.pdf
    • https://swalaya.in/userfiles/file/41989363069.pdf
    • http://autodilygood.cz/files/file/39208684277.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/97746503883.pdf
    • https://birudongker.com/contents/files/95099312515.pdf
    • http://adams-gold.ru/archive/image/file/jupavupakopaz.pdf
    • http://keifo.ru/ckfinder/userfiles/files/visuwobojesowopin.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/lunusi.pdf
    • http://dioceseofniranam.org/userfiles/file/xegegutejegijejase.pdf
    • http://apicn.net/upload/files/395239186.pdf
    • http://strandedtattoo.net/file/tiduladiwife.pdf
    • http://aqbnb.com/uploadfile/file/gexojisijevenulaj.pdf
    • http://flagrant-desir.com/userfiles/file/widuwobulisegapived.pdf
    • https://redfortfireworks.com/ckfinder/userfiles/files/59672871443.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dusk+sky+wallpaper
    • 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_off0000b296.bin
1860e10fd0a5b5f567c8b6b46e65bbce172d74e23c6036d30768cf9e76f87262		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 10224 bytes
font_01_sfnt_off0000c9ce.bin
543842eb113cc6599931f36bc7335c333c01ef8f668c5d8df779996102dda042		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 16424 bytes
font_02_sfnt_off0000f349.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes

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