Malicious PDF — malware analysis report

Static analysis result for SHA-256 4131885b2f4e0cb3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 02:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88a3acedc5f29477bed5064251b535aa SHA-1: a3e15c8cd3e38e729414c4108e906aab809df742 SHA-256: 4131885b2f4e0cb32ab1d467966c990d7ea404800ef1c54f5257cee9b55ddbe1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=how+to+save+a+webpage+as+a+pdf PDF link annotation
    • http://pamatudarbai.lt/ckfinder/userfiles/files/29428199405.pdfIn PDF document text
    • http://fivelscope.net/fckimages/76180415469.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/murupuvarekorope.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/98347016602.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/40065154371.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/wuzorirafopupinugubimax.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3e9717e664c702d8fee0f2ea1c4e9f2c/nadefot.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/50723923658.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xukuzode.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/73059591735.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/nexujogufixup.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/widuvafusikukokebefebe.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/nomuli.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/87163034314.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kezepurabapinukeporotev.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/sesadovokarapetorisino.pdfIn PDF document text
    • https://eventaipei.com/upload/files/dikelumotuzuxikul.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/kawuzanorox.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/59858620131.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/11912260623.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/16813634864.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51442999740.pdfIn PDF document text
    • https://rcot.org/userfiles/file/9853500319.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614509af4ea2f---wowobibageludaf.pdfIn PDF document text
    • http://zl369.net/userfiles/file/xakavoguzifox.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/81256535275.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210916_CD4CE83235D23D91.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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 18220 bytes
SHA-256: b9e61490bf912915b958db522038bd709be2562dfcf6217584dd0f6d35e24ebe
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 10612 bytes
SHA-256: fef391f063e74cf11317cb7f2be9bfa773f0a029df00feafc5fd8edc57465337
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1