Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ee465078cae40c…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 00:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3447e031fc8851b79b59b13cf38fdd00 SHA-1: 0a3c0e973e4e0eeae57f448edffb09310b532ae5 SHA-256: 21ee465078cae40cc4a4dede3f827e1299aeab0e9055346aae94554c3876d831
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm or content distribution network. The presence of these links and the high ML score suggest an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mprime.net/ckfinder/userfiles/files/63804508600.pdf In PDF document text
    • http://monteconsultants.com/image/upload/File/sovupevipabiraguwobef.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/66518930306.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/56977586477.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e15705a3---bokojelezobebusuditunoko.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/vapofomovifagufedejokin.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/difaf.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/kiziwelezuvopesome.pdfIn PDF document text
    • http://www.toptehnik.si/images/laladobuwekojubat.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/5841602925.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/54919041490.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/86863275342.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/linelolurivolefozukibef.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/taxosegutukuj.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9eb5f814efe0ebb6268ca5e2e9982361/zebavakuxafepamarut.pdfIn PDF document text
    • https://atavio.ru/files/file/97397587554.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mazisotufosam.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/dubelilibeka.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/magukisirozikaloruxux.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109200348327112.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/4963353245.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bipebaletonalak.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jolesiturinuf.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/7642997278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=super+mario+64+sonic+mod+download+androidPDF link annotation
    • 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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 11084 bytes
SHA-256: 60e7180907cf881b70842ae73d4f953174d300237bf607690a184b05690da15a
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 20396 bytes
SHA-256: 21ff56f37948b8f089e73acf67f61ada6f14677f18ea5142cfc0dbfc66b7f1a2
font_02_sfnt_off00014053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1