Malicious PDF — malware analysis report

Static analysis result for SHA-256 f266edb55d46ca8a…

MALICIOUS

PDF

74.4 KB Created: 2021-10-01 03:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1834ceffa2f8db8845690b8ac2ecf555 SHA-1: 855488a7806f9a72d1418d8f291eeed47b870013 SHA-256: f266edb55d46ca8a16016af5d622da809bf03924b61c258b021703574aba4ac6
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the numerous external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM finding, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=onam+songs+download+mp3 PDF link annotation
    • http://ccadl.com/files/20210904080638.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/17940273073.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/38410680249.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/gunekexubidif.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/76744861604.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/rumifokomebomuso.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/moterafevawuderawukarus.pdfIn PDF document text
    • http://melabo.com/upload/files/86540197374.pdfIn PDF document text
    • https://777mto.org/contents/files/panerigeragoneduxugikam.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/tovotomikiduwa.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3d84e3f7---9969040309.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/50456463857.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/kinoweburepisudofuse.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/potalutavanomesesemuzidas.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/4966157084.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/talibebadodasu.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/xufajopawubazudub.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/suwavulopavelad.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/xizipisejepabojuna.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161327f999c24c---18625331793.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6139388b6976b.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20211001053152_767659012.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/61182833887.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/57074921007.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/92114258608.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210902225224.pdfIn PDF document text
    • 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 10596 bytes
SHA-256: cda69265f676837352fadd7454c02241adf10309e1fff5202c2d644853bd9970
font_01_sfnt_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 18444 bytes
SHA-256: 7343374b6e6abc655550f188a28c8f6ceb4634155bb50caaf333b71f29ebdb62
font_02_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1