Malicious PDF — malware analysis report

Static analysis result for SHA-256 848c239b407b8194…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 06:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6003eb629afc0542b3c726f7756cf1f SHA-1: c8249fc2cda39326f7215ddd473279dd49c0a10f SHA-256: 848c239b407b8194d216710a36240f868af74e39afc1bbed57a13b6bd15a43d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=bhojpuri+new+movie+2021+full+movie PDF link annotation
    • http://auburn-companies.com/userfiles/files/29251001419.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/levalaxajefo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613598eeca33e---59339949457.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/pokuded.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/56274864820.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/kunupoxewizonaka.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jofebijulajomupow.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/58721920768.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/77427558951.pdfIn PDF document text
    • https://panoramabyty.cz/content/38404020394.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134173853285---tokelun.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/sefubufuxakovonapamaw.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/vokabugugekadoraviwitix.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/47997023859.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/11501097241.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/62365097884.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/zefojesosupoxaweb.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/kodumakob.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/fiwurufusipar.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/sudewefewetitajexerikuk.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/77684814752.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/45374280092.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fuzazizolugumitutig.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/52235905150.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 10924 bytes
SHA-256: 92e3c3943ad6e7fc0a1313070774ee6de807b7f4161480b1280b4651f256c867
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 18916 bytes
SHA-256: 865a74b4a213a3a29a44c5d2eeb1e00f9b25146028e33845e44aad88bb2d1bf6
font_02_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1