Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3ad6bd524b0a6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 04:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44c965e453287ff829a1a869c615bfc3 SHA-1: cea569e1e05c20baa471a35c974062faeb743362 SHA-256: 1fe3ad6bd524b0a62f941956fa5c6fbc56360163368c35cb63a25dad25d094ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'smidgel.ru' with a 'free xbox gift card' query, strongly suggests a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=free+xbox+gift+card+codes+2021 PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/mabafovogufavarogetimase.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78552379158.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ab4f49cb78cba124439bfeb1a339837e/43250450700.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/balerana.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/dukimavizedopewev.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/52541919414.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/95223221959.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/40367019371.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/86893157054.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/wokixasaxupubaxu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/40312507899.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/zabuxikufilizetedijafajex.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910065344.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/74811351166.pdfIn PDF document text
    • http://fitviewer.biz/files/file/19776672629.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/godejukurezobuluzen.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/22361136499.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/82069442402.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/40302643793.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/kesonezekebik.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/watirusomivak.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/momenegixulufilovimew.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/45292444525.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/xuvidikutu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/03b3730ae0f916a26b64bf70dcd9a8cb/xixanurubizatula.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/8634170215.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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 18476 bytes
SHA-256: 63f06f5bdc570f3a45e4530205f8440bc4381f0bb95f0b7b995ef14ee07a6a5d
font_01_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 11012 bytes
SHA-256: 21b64e7e8a4ee49d3a7a5fecd5df191a7a14c63d67f68e4b411a43c3c5aa0f1d
font_02_sfnt_off000129a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1