Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee2ae1fd4ba9136…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 13:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56f893739cd1fb2d7737497b9500948a SHA-1: bc837e1c4d515b02503098c0a3aecc633f0f2c36 SHA-256: 3ee2ae1fd4ba9136f46312f19b1b47570c76f023334b4f5f83b4d1bd154616df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one with a 'utm_term' parameter suggesting tracking, and is identified as a link farm on disposable hosting. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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 https://huntic.ru/uplcv?utm_term=pathfinder+ultimate+intrigue+pdf PDF link annotation
    • http://blevy.com/ckfinder/userfiles/files/kefaf.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/97640858930.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/mupobabiboxurevupo.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/64391430693.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133811024ff0---43265399050.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/xesimomur.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/27096918892.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/89489737604.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jasigokodiwepemekumaja.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136c96353eae---40647235274.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/razewaxelodurofo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091318385173499.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61e500e99---duvegital.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_8C2A38AF1514920C.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/fopidemisetelud.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/begomud.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/84191522042.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/48618363061.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/fitilakiletujijan.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/4852251257.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/34122578363.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tibopekobib.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/3527447044.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec860a059---58600343621.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_off0000b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C0 10756 bytes
SHA-256: 6a4c782b5c7beec4c72bacc11478689c8e0584eaddf444c5805a79a1b4c6d4ad
font_01_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 15164 bytes
SHA-256: 5398c12406aa0e724bfb66faecf2fb0c5be4b8c0202160605adcba8f39f9c043
font_02_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1