Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff78b49d3144aa45…

MALICIOUS

PDF

85.6 KB Created: 2021-09-22 09:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6aebaaefda5b4ca1a9c05501a828981f SHA-1: f586a420add3bbe9fb7016e66ab185725bf5a757 SHA-256: ff78b49d3144aa453d52c492208c35af89b6a3ed2c7fb962f105e5f63dc8ceed
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to suspicious domains, and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://likuidart.com/files/ckeditor/files/73186887833.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145398726393---40808383636.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/83564209995.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091317054681.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/10066841306.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/zisujenekarux.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80337193164.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/60967141499.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210902_9B68DCDCC1A251B9.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/vijinolezetuzisezuj.pdfIn PDF document text
    • https://tckontrola.hr/files/pifosunaxajusibanodo.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/96451209395.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/82726423830.pdfIn PDF document text
    • http://vuason.vn/upload/files/kaxokelijijizexexoxe.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nugetuwarel.pdfIn PDF document text
    • http://zuche0551.com/upload/file/49030540396.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/7768338814.pdfIn PDF document text
    • http://domplus.su/userfiles/files/50347773863.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/suzamisetarepeg.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/84795459488.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cc63cdd3---85239579338.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109200346381832.pdfIn PDF document text
    • http://marymo.ru/uploads/files/30061688168.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/tolunorur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pixel+survival+1+mod+apkPDF 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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 10764 bytes
SHA-256: 39ea2eb71ec64189878e7d2a528dc86e8e6fcd4623a2445598e6a6f47e003397
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 18128 bytes
SHA-256: 08fc1d8bde0d80552a38e5adb2d6bd4206770eb7f9deec86dc6c0538c410ab30
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1