Malicious PDF — malware analysis report

Static analysis result for SHA-256 68215323d5a7bc0b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 01:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e48552f668e84ee11f307682cef512bb SHA-1: 334af7c35604e764c72db99e5318947ab60b9e71 SHA-256: 68215323d5a7bc0bdca2676554a810ea503269a5d095d8743553eaf9587cd2d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=face+beauty+video+call+apk
    • http://lexprikson.com/admin/style/images/userfiles/file/gelonurutijusumevozula.pdf
    • http://crmloccitanecr.com/campannas/file/479076640.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432f293a6c6---dejunoludo.pdf
    • https://shevtsov-art.com/uploads/files/ragosezuwuti.pdf
    • http://magnumprint.ru/upload/files/getirimumonirureluwonago.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lezikadomavitukotegipif.pdf
    • https://forexinc.ca/upload/editor/file/lofiloxasorijopowoguniri.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/16111709343.pdf
    • http://dmkaudit.sk/101/upload/file/vekunopijodaxup.pdf
    • https://jackinthegym.com/uploads/files/202109010837582123.pdf
    • http://antitumor.org/filespath/files/20210919061417.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/xofoverezetivezikad.pdf
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/8144122638.pdf
    • http://lachambredechos.com/userfiles/file/47815129924.pdf
    • http://drapa-technika.cz/UserFiles/File/73726194959.pdf
    • http://kovospm.cz/fotky/file/nepexijaxubofiginaxapa.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/82024241531.pdf
    • http://hnc2.com/userfiles/file/jofubokem.pdf
    • https://hashtag.school/userfiles/file/94532191141.pdf
    • https://espiber.cl/images/uploadedimages/file/80750546013.pdf
    • http://studiorinaldibedin.eu/userfiles/files/13377434946.pdf
    • https://mehreganimaging.com/images/upload/files/vodukigibiside.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146537c00d69---71841506991.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/78109227885.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_off0000bc4d.bin
86587a94b18d113ce079fd89e20a1fd30b4c3df8594774aa88ad0c10c02eea95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4D 18760 bytes
font_01_sfnt_off0000ec98.bin
b1712b403910779ab41f68b3020c9f65089ef0df073f72ba62d4d97b5da55f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 10624 bytes
font_02_sfnt_off000104d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16792 bytes

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