Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3da3e465de28d0…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 13:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d14e82f80137adf9567101c85e083e88 SHA-1: 7fa6d04d575a6eb51cd511e29112dd4706011764 SHA-256: fd3da3e465de28d0a4b8cfaf53dea2407cf83e87b7bc3c9b527d8d7043de4933
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external URIs, including one that appears to be a phishing lure related to 'harry potter and chamber of secrets book pdf'. The PDF structure also indicates it's part of a link farm on disposable hosting, suggesting a phishing campaign. Although no scripts were explicitly extracted, the presence of external links and the phishing indicators strongly suggest an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=harry+potter+and+chamber+of+secrets+book+pdf PDF link annotation
    • http://etyekilovarda.hu/userfiles/file/3949787294.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/vulevafoxobusozadus.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155db819d031---55146576473.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tupedelexosipe.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20211003132235692233.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/rapovefuv.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/rubudebenesixe.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/1200234003.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/40437944638.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/71618383708.pdfIn PDF document text
    • http://alidongdong.coco1490.com/upload/file_folder/file/gobimanalidarolurovugi.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nijer.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/vavuxis.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/44950978769.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/fijateku.pdfIn PDF document text
    • http://test-immo.com/file/sameludaduguvotub.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fijitoselegudaduf.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/xofibefenudusutafajel.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/9608127246.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161344041a8849---ziposagalimofomagoze.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/tegifidadonanitajaxafifa.pdfIn PDF document text
    • http://baove24h.org/upload/files/kegemufakutokujamog.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/27966509166.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/60451728163.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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 11084 bytes
SHA-256: dfdee07b674c3d15f96e4e9e280a99db3d9385151ef855850d1a2d2073a26765
font_02_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 16316 bytes
SHA-256: f04948938ffa7950d32c436627f0f9e115aa69afce5908c79891b40c557eb3c9