Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a44a6ed6c356d1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 10:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11096462d2ebeee8961b74b5bb37d174 SHA-1: fde2bd91a89b94a028bdbd0e6169e2c09258f7a9 SHA-256: 03a44a6ed6c356d11495192f1909ea6076fdbcd24ab1b5a8650284cb6ee1ef47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest the document is designed to redirect users to a collection of potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pensiuneaselina.ro/userfiles/file/87660191523.pdf In PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/wovorizawapote.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/49789721865.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/xoxogotivaporadizi.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/66437379635.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2e96f94d---31562187505.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/xininumu.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/melopunubakupivimepax.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/tidobolimi.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/fededujosovuwo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/dosefopomimafiturojisuve.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/padujexodopesujukutux.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210915155444.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/61413947250.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/wekediladolumemifupaje.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/dujurilumis.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/mopupaxeder.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/50623388675.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sanex.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/fakegibovuwapuzubon.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/getoli.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/kiluxebaxokomi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/65308889406.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/66383038513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+send+audio+message+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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 17932 bytes
SHA-256: cece17b05b1550d899677004c2c75c0acd1535ee13c7b83d0da6c93f74aba00f
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10724 bytes
SHA-256: c92f3ab50e643e9b68faa1d11ce66bb91b821fbc5ca24b874b333c5b6861f415
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1