Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff5031651968fda…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 04:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0909ed315c37f9d33bce0070c0a7768 SHA-1: 506d3adf31b732ff5dc6fff8e41ba84cff7859bd SHA-256: 9ff5031651968fda6d4682c1cc2b1b947bd0a4fed5424d027c25326e9ac1669b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are unknown, suggesting it functions as a link farm for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sung1.com/upload/files/sezabemotegesarisedutu.pdf In PDF document text
    • http://dissanna.com/temp/fckeditor/file/87820954276.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/11237119292.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/89695415657.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/84743545975.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kobepameratavevavezilenev.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/72492276423.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamagijupogetebemo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767bd8932e---remele.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/2046777293.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/xumaremitonap.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/24197643015.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/boxeveludukomixuw.pdfIn PDF document text
    • http://logicamail.it/draft/media/92988715920.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jugibilabolufara.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/13912520648.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/66842822016.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/47998906550.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tusizanizaximonitopikut.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/zinebupun.pdfIn PDF document text
    • https://atlantidegattico.it/file/vefarir.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/vebonejebibopiluwe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac8be5d0eabe6dc465f88f371a6bc90c/jexikalekaxesip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+live+tv+for+firestickPDF 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 17704 bytes
SHA-256: 55573a5f1f36b517e7b6376b1cccd3c42a3963d696b43582ec9fc5d560735d9b
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10276 bytes
SHA-256: 2e5630ec86b835632d45455988925f9c3ed37e552f049b8f5f246815e5cd326b
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1