Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b33c8bd4386e40b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 05:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7a4220dc15c6f58e2f41ae02a46995eb SHA-1: 03c8932834bb8dd4ebefd8a4a86a89048dc1daa2 SHA-256: 9b33c8bd4386e40b4fc4ece8b84a14f29d3d0e2fa778eecc8f1d9b7ea9ecce51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm hosted on potentially disposable domains. The primary attack pattern involves directing users to external, potentially malicious websites.

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 http://classicalgardenornaments.com/uplds/file/gatapuv.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a64a25e943---53188352432.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/regala.pdfIn PDF document text
    • http://vtaky.sk/media/file/buvegopak.pdfIn PDF document text
    • https://ms02bet.net/contents/files/15516159738.pdfIn PDF document text
    • https://producto.works/userfiles/file/zavevewufujufede.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/2494102167.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/50619444056.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/95617197539.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wopixewewatofomadirubega.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/6722618204.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/58381986699.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/56371516303.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/68902388328.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/44597251711.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/wewabipewurokimuvasedez.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/49712827119.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/foxasomidatuwex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0702a8d6---29059880184.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/zumoganati.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/nomut.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210916_671A7FDB2C4C0EE0.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/16532726974.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/luruburunapo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jerijoritowokonidunisune.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/32873162200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+google+android+sdkPDF 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_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 10612 bytes
SHA-256: 720bc0c1ef66e3c51d793cee5e7868e9322cec5295a32318c7cf96f5171c98b3
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 17784 bytes
SHA-256: dc970d65f660d2d92dc396d29a8ef380315d84d73a216c7ae7417d5046de0ba7
font_02_sfnt_off00012a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1