Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf34c2f0bfa9400b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 13:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d75c8c275d73cc088d6e98f03a5262be SHA-1: 2efd9f329e57d566d193ad8af5be1e4275d40dbd SHA-256: cf34c2f0bfa9400bae24725e6e6b0d92f661a5171215bd31f36568b9f0948141
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=nba+2k21+arcade+edition+apk PDF link annotation
    • http://tangiahoang.vn/Images_upload/files/pekedubixew.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/kibopexurexijebulaz.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/21090176161.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/xoboxexekidoweva.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/ponurelamafuzimog.pdfIn PDF document text
    • http://scro.ru/pic/file/kesupete.pdfIn PDF document text
    • http://jn-zhsc.com/upload/ponofokakokovaledego.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/jametuverizel.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/siwibuxu.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/46844564545.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161441425cdfec---zedasoduvow.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/mizajan.pdfIn PDF document text
    • http://w-mill.jp/images/file/45547793382.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/81767396978.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/31223226996.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/palunajifavobelalam.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/40050749859.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jizodojibudaxiburoni.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/66107337592.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/91566800562.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/61268026476.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/61764133133.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/6703708160.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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 10672 bytes
SHA-256: 7f5050bbc66a67e31c9ab207867e8c24b3dca73e0cf07fd352f5e531f3f0d0a6
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 18176 bytes
SHA-256: 1651e2013b16c4ac05a1054e140d2a3f4a6a8036011fa6d922faf6a72d72cde2
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.