Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e998cb65a137073…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 21:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b57193ceb78cda627389c4551c1c290 SHA-1: 0cd3570a58dca6af1ecc6a74745b4141db23f984 SHA-256: 4e998cb65a137073c37cb97f5f05ae3f494bfeeb8926c000acb88f272a7f7170
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate a 'Payment redirection / bank-detail change lure', suggesting a phishing attempt to trick users into updating payment information. The document contains numerous links to external PDF files hosted on various domains, with one specific link identified as part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://showpalmedical.com/userfiles/lifidowirutebeta.pdf In PDF document text
    • https://hotelmitrutarija.com/uploaded/files/kibibekosali.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132387cbc116---29330347404.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/78529541607.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/92245595855.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/worepe.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/sozovepelifijepuvibitaweb.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87666543653.pdfIn PDF document text
    • http://lukinserv.hu/file/73527999906.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/kediko.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/53406897706.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/woxakezi.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210912_A71ED4D936377AB4.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/56262233370.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/tolajagamevotagumama.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/42232649969.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vuvaxojozo.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210905132913.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/9866633725.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/473086635.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/3321836219.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/8166375860.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/tusasajelidomokujaxabe.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/durub.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109091505489070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+transfer+passwords+from+iphone+to+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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 11048 bytes
SHA-256: aea1ad967aef72b1ad0a506ee2a454097b52a79c1b37deb546cb124c8ec7b646
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 18120 bytes
SHA-256: 0e6258097d6677f6f01144283b3bdb4652f9aa2f47e56bcd55d493b13a5a211d