Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5eb4ba73b3875a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 17:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b34a7017b7706d005e304302c902c6a SHA-1: 6580cd0a12a3cc8623c34a6c944b7f24d03af6da SHA-256: da5eb4ba73b3875acba9dd0434cc6508d56e367b23900474ae2d4405348d977c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://queure.ru/uplcv?utm_term=como+bajar+un+video+de+facebook+android PDF link annotation
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/89481693429.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/7425552988.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/makidapebujesix.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pawemisosekad.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/pineripul.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/defadakipolaronew.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/53844016402.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/6075523267.pdfIn PDF document text
    • https://estoniapools.com/contents/files/63518816030.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wiruveguxudi.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zorepuvenivapuxitubel.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06abdbfb0b9e1447375774de953c8ba3/56254740874.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/23917494110.pdfIn PDF document text
    • https://maturana.cl/upload/file/minaligupiremuvupijezep.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a4e51645---pepulowinuxezukumeleler.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/55799579592.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/19012600810.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/zanipo.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/84162155871.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/geliwapawuvax.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/vakemevezozogev.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/sawiduwuli.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109160647064100.pdfIn PDF document text
    • 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 19120 bytes
SHA-256: c74684cf83a93b3855e11950c90c352f65d4380963bf843c956cfbf0e4809d65
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10884 bytes
SHA-256: 5d7e606fb0c89a8bd2273d6f450ceac49f723f8cc6739211cde6d70d22146183