Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec03b0dfd3845c91…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 14:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd405342eaa76070f67fba898cecc4e6 SHA-1: e59217e916509baf9d1845f9a23ae18d97ecf646 SHA-256: ec03b0dfd3845c9182bfd1f556a33e5631567509c1faaa4f0152474fb22dd8de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.oiseaubleu-promo.fr/userfiles/file/verasasifawoxirevevekefe.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/pepibef.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffa83fe0d---xabujiminuberoz.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83878301533.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55213232726.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/93145305344.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/jemulavodoremupekelufoja.pdfIn PDF document text
    • http://primaneighbors.com/userimages/62644556092.pdfIn PDF document text
    • http://fabtur.ru/upload/files/solewugufitaviwo.pdfIn PDF document text
    • https://seikai.jp/free_images/files/senewodafofun.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/46764775670.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/71520850228.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/29492811793.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/sapilo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136f00420ce9---foxojolufodijenoxepopetev.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/93349770300.pdfIn PDF document text
    • https://windsbs.biz/files/file/76416890710.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/zisawefora.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/23296556343.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/80708605503.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/najulon.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/41144817861.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/joxugavibijevorupalexava.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/nowidujutipogizaluzupameb.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/febosepipukuzunimajebakur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=zombie+multiplayer+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_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 16852 bytes
SHA-256: 3d7da687ed2cea66ce3c6683281beecfea62b9ac0236dbed0e1a9c6a981cf860
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10700 bytes
SHA-256: c031b14cedef491b758f4a8c70526d5504528279dea743c61efd6eb180564d42
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1