Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fef1de4434978a4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 22:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d6dcba14f1b7de7b5b68d886d42f699 SHA-1: eaa526f5053567a96c82c5d08430d630dffc6eba SHA-256: 5fef1de4434978a4aeb7851509aca677e1907462fac05d03dd94bf31d689647b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to T1059.007, and the nature of malicious PDFs often implies T1566.001 as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://najlepsze-w-polsce.pl/uploads/48058540624.pdf In PDF document text
    • http://synphabase.ch/upload/file/18857326914.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/zilezazos.pdfIn PDF document text
    • https://uangraja.com/contents/files/59077767308.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/jodudal.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/xidijinaginuzav.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/60752380918.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/26560455007.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/fabidupesalokugoro.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/87356418993.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xepezinanato.pdfIn PDF document text
    • http://dalaichau.com/files/suluxilelevugewajobepulon.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pazifazozota.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tquvds5d03p8q6n4gv6rbtkdn3/xodejavumupowu.pdfIn PDF document text
    • http://actinq.nl/upload/file/dabuwuzu.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/lokuxipapafelavixuwakakug.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8a4d6476---mosirozezixejet.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/fidem.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/babopazarexabituz.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/54550813445.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/45045373677.pdfIn PDF document text
    • https://norservis.cz/files/files/36729756508.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/pijigamatibugesezem.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fexiwetebemumijozi.pdfIn PDF document text
    • https://tdfstore.it/file/gajexuberonawixalofotek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=websites+like+ytsPDF 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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 9952 bytes
SHA-256: 947f10dd69aab4cd54fa36a9652a891b159fd9845e3b2e0ecaccd9770a688b93
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 17116 bytes
SHA-256: a5d8141e11c7bddc1c0112fa54f4b394a32231ab6310369b9d9c86d0de395893