Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eae094bee465c2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 10:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7905e45654cb50a3766597f9a63f631c SHA-1: 9b90a6208914bdda6f10f1e4e30def2944e4852c SHA-256: 37eae094bee465c2cd8d8ba8986ae0d8a689f9c3c02ef9a3d3a96c855233f9da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+do+i+find+favorite+pages+on+my+phone
    • http://fatamorgana.fr/uploads/assets/file/nazazewekokalerajobotago.pdf
    • http://orenprom.com/img/account/file/basevevuniwirixedi.pdf
    • http://torgoborud.org/images/file/danak.pdf
    • http://rehahomecare.com/upload/editor/files/63081878490.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ronelekowinusemadugizedit.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/68573785292.pdf
    • http://didopack.com/files/21963573348.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/vozisibamar.pdf
    • http://nfc-lampang.com/user_img/files/julufakarubofat.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jeruvipusosal.pdf
    • https://gyn-koe70.de/obrazky/file/91444175867.pdf
    • https://privatecambodiatour.com/userfiles/file/nufananafi.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/kumevowipubo.pdf
    • http://yokosohk.com/files/fckfiles/file/xuxogizuparekasazuk.pdf
    • https://yoimart.com/upload/file/20210906074529.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/50907677804.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b71ab0c78---75950251282.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/wezina.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/fefabomirekosiraxafupefuf.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a962064c8---wekipefugoxupomoxubafemi.pdf
    • http://www.findvoters.com/userfiles/file/gumik.pdf
    • http://sys-svinding.dk/userfiles/file/mupalisujafexasuxumow.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/vorukogeragonitaso.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/topopuragapodavuv.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_off0000b545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16792 bytes
font_01_sfnt_off0000cd57.bin
e907f82cdf23a778811d67870286d0a054877fd5d3a17af13d85dd6bd7f2b4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 15452 bytes
font_02_sfnt_off0000f45b.bin
356988800ddffd0a28099f4a5784209b52875dcccbedea66a5630cf12270b7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11156 bytes

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