Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae97fdaa78c88835…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 08:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5b9fd8d86b87fff9655acdeec81a9dd SHA-1: 0d857328160eb1e5e2cb4d10208d3e6c6a66dc70 SHA-256: ae97fdaa78c88835cff12413910653e412840661af23a10d6f96f32771cff6b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

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://philabc.ru/uplcv?utm_term=gfx+tool+free+fire+booster+apk+download PDF link annotation
    • http://kurier48.pl/files/userfiles/file/pejurajumanonabazasun.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/silivajumigewexitep.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/loguwijoxitewojidi.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/wazowototukinovije.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210910185932.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/sonilopezobosudiludile.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/josamakurugituzovujo.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/34133921843.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/sokeno.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/givosem.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_048F42674F094A6E.pdfIn PDF document text
    • http://dnepropress.net/files/file/pixubefi.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/duvogemokugozizaxo.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/20362605289.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612edd63f03ec.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/povefuledate.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/88353844816.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109071504283821.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/gulokidogifufovuribi.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/58980784220.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/15680814714.pdfIn PDF document text
    • http://stefani.cz/fck/file/19984243955.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613165828bc20---pagiwesipijajedumiv.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/33423595582.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 18792 bytes
SHA-256: 5e52fffe1271aa7422d5ce2035e630bf2d048269dbe7baf0ad2b76d66d9562aa
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10948 bytes
SHA-256: 576c8660de0fdf5e3a43d837c28963bcb9abd5e02a7e595d69c7034de418a3a5
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1