Malicious PDF — malware analysis report

Static analysis result for SHA-256 792589ebd4bb40eb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 16:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e616f5a5eb9aa538796ab41324fe978 SHA-1: 60aac36d0a59c797134d252eda8fab4783642eed SHA-256: 792589ebd4bb40eb6cbfc8b442ef671a63495c9bdd0a9284f20f4f1ff7401f39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a large number of distinct, disposable domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://npkfertilizerproduction.com/d/files/86956760777.pdf In PDF document text
    • http://improntediteatro.it/userfiles/files/gijesibasokunusuxi.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/29883418336.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/nigiwujoxepivo.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/44549490726.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/138199457.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/vulod.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec43387425---kilekejobogikasijuferemi.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/4357367990.pdfIn PDF document text
    • http://i-physiology.ru/upload/99316009499.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/67810713347.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/99478988831.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133293554d2a---dipilenogogabuxuxutesujox.pdfIn PDF document text
    • http://elitacasa.it/images/file/52621042187.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/sarapesowegabepigadizoxe.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vugul.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/vexiju.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/nanasil.pdfIn PDF document text
    • https://granitnet.hu/editor_up/10338911909.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/71072798106.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/60475576032.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/5175548916.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/87805149283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=video+mp3+download+tubematePDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10752 bytes
SHA-256: 873f5df136d15a8a38b41ac9d5421c867b0e0b187d5ffd5a601b65132bbfcb73
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 18192 bytes
SHA-256: 959ec735d6dcec205acc9b420ec8a990932c154112f6b3b7d3c5531b31f5ce71
font_02_sfnt_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1