Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ad48fd22998b2e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 19:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf8c1f821cf339878094fc30f039e071 SHA-1: 32c33910786a48b6908b571168792b5b5a742f49 SHA-256: b3ad48fd22998b2e99571bc579f130ea27356c84cc224fe0e35deb46c7ee540c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kimkhimientrung.com/uploads/image/files/rijuwubafokijefamo.pdf In PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/lizimebudumebebomof.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/rodavef.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wopuwoxosu.pdfIn PDF document text
    • http://vladekoservis.ru/files/66509301849.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/wesotolopela.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/bubenedozaludaneduvuvivol.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/tosavija.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wonarotenegazoxoxanidaxaz.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nivawibebilisojufo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/97573050614.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140962c9ac8c---97758654414.pdfIn PDF document text
    • https://tipresentoio.it/images/file/39406565715.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/8228210094.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/jesogazarug.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/84732047788.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/dotefuvi.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/40761742110.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xajaduti.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/77125477509.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/gomediretilaxisikirekej.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631197861.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/lidafeforarabonevoberu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wegasodokadotawogoxuwul.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161355e7fd0826---kerojeviru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+my+iphone+to+my+android+tvPDF 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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 17528 bytes
SHA-256: 344efb9a9e9b45cf8c38f36d720ff51550f786151411dd7657203c1678d7843d
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10824 bytes
SHA-256: d257ed8eaa962d99789d2b9582ea188dcf90195583288f121c80a29e83464142