Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef143c053d2311d…

MALICIOUS

PDF

67.4 KB Created: 2021-09-10 18:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b06969fe3e2f947498aae9bdbaca4c2d SHA-1: 85efa2881eaf0047dbd2dcb2bf0eefa091d3331f SHA-256: 9ef143c053d2311d5d89d3fdc1e4cfd1fa153c852edb01aef4cd11577e6d7f92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated, but the heuristics indicate a likely image-based lure designed to trick users into interacting with a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://penzion-pod-rozhlednou.cz/img/file/18059455937.pdf In PDF document text
    • http://emblem4home.com/UserFiles/Member/File/8931317518.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///rokokutawemon.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/43186850427.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/51510774025.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/nomofixodubotefe.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/11638236685.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/puvopolixunexukawe.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/76254757600.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/97561164791.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kosaxa.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vesuzazi.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/butoxivatakatozemegikev.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/76730256082.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/97606878463.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909021622.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/dakemepuverupivux.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tolov.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/43607115650.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/limesozubibiguk.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/57360429113.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/woretefegar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b933ef197---bonodozomilotikizutavoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+download+loeschenPDF 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_off0000ae74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE74 10436 bytes
SHA-256: f1469bf54733c7223d8eed24fc973378ebc846c3ae7a0e7c93ea68f7e8c04d60
font_01_sfnt_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 13864 bytes
SHA-256: 2caca42e90d7f38c45885adaff08ad7b5daadbba2f3cdf6a23818180157690ab