Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce21201e2cc2ce4d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 04:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 605e7e31c6e165831bd0c4e96d500e33 SHA-1: 700d00b8ccd5395a0fb5beaa964028aa95e4d4d8 SHA-256: ce21201e2cc2ce4d6338423e8f9c2bc98e0b4c66224bb83315a04330107563c2
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, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to lead the user to a malicious download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with the 'utm_term' parameter in one URL suggesting a lure for a 'car game download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bekkercoon.ru/ckfinder/userfiles/files/26462217062.pdf In PDF document text
    • https://markmont.eu/editor_uploads/system/files/56047280301.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/ripejakojaxivamim.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/23026443109.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/dexovozopirakabomemepux.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/guradidaxanesowine.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/99162598752.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/raxitakafasokuxerenovifis.pdfIn PDF document text
    • http://basisnomor.com/contents/files/16396548071.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/wudegitafovukedug.pdfIn PDF document text
    • https://vleek.com/uploads/files/voxutu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/jifisozuko.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/turodogozu.pdfIn PDF document text
    • https://value.ae/userfiles/file/6533893679.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jasatasokakera.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/87148310815.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/73766834046.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/29237924404.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfe7f1625---62156854033.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/6027604284.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/20850746336.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/24096088758.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/250c98a8c8f0e47bc5c2a05258ddfae9/kunafog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=car+game+download+apk+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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 10680 bytes
SHA-256: f5bfd2d1d6bb365a2fb2bbd2cf00d96c448a2c7c4e090a9b12838415c1249909
font_01_sfnt_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 15108 bytes
SHA-256: 2218f000f706dd98914d43f3c3edc57be5211bf02069d4ccff052bb514ba79ff
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1