Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e527d4f26d501e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-27 11:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1b2fcf1b5c5c26e6588ac5ecf75c243 SHA-1: e1ffdc003ff7350d5005e09f997d08bad938e95c SHA-256: 87e527d4f26d501e38c5a737f01aba3db64928dba98af2d0c12095bc94db1965
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing 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 0.9846

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 http://alajwakh.com/uploaded_files/userfiles/files/babanijek.pdf In PDF document text
    • https://protum.se/file/punenidabenatutod.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/piriwud.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/sabirumepuxonajir.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/93929913191.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/28663653903.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/40100831085.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359464161d5---32261292527.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sijabuxiku.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139107a9d1d6---97930157920.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/voxivu.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/girilifivufov.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/58644508497.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/6545832049.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/vofivedutadifumatatosol.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/75459254103.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/rorositetufoziva.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/nusekoradelagufunixiti.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/jurolukopufuk.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/62799266765.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/xoxedap.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/kagezaraxugafowodupitiv.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/sewolasitalavotebiso.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/5118460786.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/94531662134.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/feposexilewini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cara+bersihkan+file+sampah+di+androidPDF 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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 10928 bytes
SHA-256: 0f7ba1e53d43e5f314fdf41ef13edd78a419fc5232a373d32856d8ce071ea3c7
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16444 bytes
SHA-256: 3ee1f7b7fd1ec4bfd26073f47fdb8bc28f83e944d85d3aecd5252787233183c5
font_02_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1