Malicious PDF — malware analysis report

Static analysis result for SHA-256 331f61514b9e9039…

MALICIOUS

PDF

86.4 KB Created: 2021-10-09 00:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3a5e8e4d80612d21c2ccd4dea3b85dda SHA-1: 18a15ad7600c41af0284e83fea2003de5352baba SHA-256: 331f61514b9e90393fa82e1896720d4d69d6ea688cde9e81d08f1852f4ff8218
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

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 http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1616080082ee2c---kodavetolalagobegizag.pdf In PDF document text
    • https://galaxytraining.examinationonline.com/files/gogadifosuwa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16152fa3dde39f---nosipoguzejetagunog.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/98994206778.pdfIn PDF document text
    • https://ferropula.hr/files/900373579.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/17259760509.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nizanowofetuxopumojuzo.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/45120836907.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/mexapadiv.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/55975170863.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/59160971785.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/jepasedobuxifusu.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/liginoki.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/metari.pdfIn PDF document text
    • https://advik.net/userfiles/file/11781164890.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/paseroz.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/vorupaxigowuku.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/penorubapemi.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/weboned.pdfIn PDF document text
    • http://namngonviet.com/user-/files/15696020972.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210914102620.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/solopavajawiji.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/28033547925.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zitonikuritopijakurexox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=importance+of+credit+management+in+banksPDF 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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 20620 bytes
SHA-256: 109c3ef3149dba2aced86b6b48b9234985790b8a86ed420ab23f625c127f0de4
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 11100 bytes
SHA-256: 4ee43e1e3f276d61b800c26b3e9f8116b4323421f8a8d5ac85cd54876635bb53

Open this report in the interactive analyzer, or submit your own file for analysis.