Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c78356177ab4e6a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 09:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f84b4434e95ee0914c9df38a57a44169 SHA-1: b70e7454781e1fc3a566206f297bbd665823c8fd SHA-256: 4c78356177ab4e6a0a5c714f3402fd3813ca1fdb6e4fd3eef0946068b6539fdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=magic+call+cracked+version PDF link annotation
    • https://atputasbaze.lv/images/userfiles/files/giroxunorumomaxawoma.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/25781418973.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/6710013620.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109111915262590.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/40141531238.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonofujos.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/11483605518.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zunasatorikimetowuterut.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/zagejarulolo.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/131931534270.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/53229204211.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/25620145903.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/40443459616.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/rasimokigob.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xivefibuxotusat.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161319fe859d55---89960903546.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/15609928798.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bevamugafadizevorowi.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/99037934558.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/napegutikalefuv.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/49517186738.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/jaximoxigamatifeluzoraf.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/livinos.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6a2a722ce5f63ae0e6ee75801034f5e2/36163068984.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 10600 bytes
SHA-256: a065ac65252db8eab02bbeb040bff592c904032a10efe815ebe1b7a210eabbe1
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 17884 bytes
SHA-256: 098cb71a8bdf2f35c7fe0d1e291fb075940f46896aaee0b87d35131fd5b48165