Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fabcf5d22813bd4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 13:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a971430cb9065fff7f574fd385d43b9f SHA-1: ccf2eb409f4360fa406dc162a101b9b9d39dff4b SHA-256: 7fabcf5d22813bd449271048a3c2c292dba415cea0b810da288187f967506c17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dentish.ru/ckfinder/userfiles/files/74228518413.pdf In PDF document text
    • http://knuhpharm.kr/userfiles/file/20210917110203.pdfIn PDF document text
    • http://fitviewer.biz/files/file/diziwaj.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/sadagek.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/dodebo.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/9639799114.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/98983467654.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/93466567716.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/5078756553.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/nopil.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/lakesotavosexukijetixufu.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/75295182474.pdfIn PDF document text
    • https://toocapen.com/files/86094072506.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5bf4f70e---37761804600.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vabewigubamilajipepo.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tefolatabigerukodi.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/69376761379.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/sugifibakenok.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/95824475581.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fozeg.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/budagoz.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/keramibe.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/nifililaxekemi.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/fujajereralo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=avengers+infinity+war+480p+movie+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2C 11496 bytes
SHA-256: b5db444d94076c1eb3535e8f5f8a34f61f1368c3c92a275d4ec9d741969a02e9
font_01_sfnt_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 17852 bytes
SHA-256: 7bfe789a83f0e4a41a290c3284b15a064f5ebfd13ccd20d36d5880c7b95dc827
font_02_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1