Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec4eea654eae854…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 00:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e314c123307a6b22a9875b069517d14 SHA-1: ad6afa01b9f894cca2970c7aa22dff2ede2a1c14 SHA-256: 5ec4eea654eae854415da45d0725ec44e6df9828bcb8d737452a14f2f1420bc2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

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 http://feldbach-tourismus.at/files/mevini.pdf In PDF document text
    • https://biocenfis.es/uploads/assets/file/jagabanuwasaved.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/50932761700.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/84403286433.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/61548068237.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/52597813488.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/nagukujorirapakixoj.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/93643795186.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/libonikaxo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d735d02d---labunarejorowoniwifususif.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/81272988328.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/9248944970.pdfIn PDF document text
    • https://tempegaring.com/contents/files/3784851070.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/tuwozejokubibosu.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/pirunukonobobaju.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/26374635856.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/mewugebijewutegofufu.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/sosakimusikozutoxi.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/51795929811.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/36417114664.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/bakamitasabugukebiwitiva.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/51605523288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+art+of+war+book+by+sun+tzu+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/56786812278.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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 18136 bytes
SHA-256: cbebb61e3a5dc992f84954044973385f8e7c6e045301af302f56d06e72946119
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 11012 bytes
SHA-256: ed373a74fa9156fc55e19d4f12216b85f7e29648c1d4d59046accc7e505cf5fb

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