Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04857d93cfd5532…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 17:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 354e6b903d30729500d7431d4a990bf1 SHA-1: fc7328204197a2d877e9949bc397c1c575928e00 SHA-256: b04857d93cfd5532929d5a7edebf7e61f6e83bdd968702e7a2f6381559715f2e
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ipayon.com/root/FCKeditor/file/ridubesamidugusojapigixen.pdf In PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/gaxaso.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wapiwutesetibomanidamon.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/palapaw.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/ruxifojojuxob.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3157a20a---weninatawagepirifi.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/xujilideputuwi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210913004818.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gonujazuvurukiridafadoduk.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/18382946025.pdfIn PDF document text
    • http://workontext.ru/media/file/12950248371.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lotapes.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/81900151768.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/mefosunafimufufotofulam.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/41399306952.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/noduzedodabavasijabida.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/70478341403.pdfIn PDF document text
    • https://petribax.com/userfiles/file/jarenetagoxud.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/kawifolesivafisapasak.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/71050729254.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/refuwujuwapelebameb.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/76414745781.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/560911594.pdfIn PDF document text
    • https://cardolf.ro/files/nojuvejid.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/gevumuvokenogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=webview+issue+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_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10480 bytes
SHA-256: b95185cc11496625cf32bb8f8540e98a0606bfc440bd8750a2dacc88224e2e63
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 17368 bytes
SHA-256: 81a8cc78f817cdb96243159d2b1c34a489d7ec5d1e889d71089ecb4272c228c4