Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5644bb2244751b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 05:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 891e9490972c1ec1323b11f1b9321830 SHA-1: e5b34e700def2431f3a98b010b83357daa41f7b1 SHA-256: bb5644bb2244751b483ec413c38f35f468a2ee7ab60f06acc09c19851b05e874
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 on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware by posing as a legitimate PDF viewer. The embedded JavaScript is likely used to facilitate the download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=pdf+viewer+for+pc
    • https://doctmcooper.com/userfiles/files/xesanol.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/44928147857.pdf
    • http://ryukatsu.com/userData/board/file/warixasa.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/63044143250.pdf
    • http://idealthailand.com/file_media/file_image/file/9800974.pdf
    • https://rusepress.com/uploads/wysiwyg/files/wemexodorobaxul.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f22deb13f---52467816799.pdf
    • http://shop-exclusive.cz/userfiles/file/88758949399.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/14382212927.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/74944574256.pdf
    • http://vertex-decor.com/userfiles/file/74666943544.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/49884445024.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/29530723079.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/gibakeviroxifix.pdf
    • http://robedecreateur.com/img/files/seboxomoleduxevomoli.pdf
    • http://magiepourenfants.com/images/mediamanager/file/28545420125.pdf
    • http://traviet36.com/upload/files/77055705108.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/33908499210.pdf
    • http://dryoucosmeceutical.com/userfiles/files/33498396158.pdf
    • http://all-vehicle.net/js/upload/files/kawunotezuxa.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/lejuxo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161492dbde3890---fivuvujup.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/veritutalazagojedevana.pdf
    • http://myucmas.com/userfiles/file/pukigakipadufoporunir.pdf
    • https://hanomanberjaya.com/contents/files/50527163260.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_off0000d9b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 16792 bytes
font_01_sfnt_off0000f1c7.bin
cc56f749986ee22cfedc3e592fdcb9e831cf299cee570c0035c1f918e017aaa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10188 bytes
font_02_sfnt_off000108b4.bin
dba5f8a544d450a44d1d5e88c3a89db3dec1d1ed8734f2e9fc8c38a42b2c3e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 17284 bytes

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