Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a725b6de0e3daeb…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 01:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33b9df13083532d6eedd50da7bc1d5f2 SHA-1: 48b117d4eadb314033af89d6b546f95262028812 SHA-256: 9a725b6de0e3daeb9f699e6b5fdc36b2a5dc34ee17d9850138dfabdceb62f4c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • 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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a618bdcee---9847951460.pdf In PDF document text
    • http://arisutour.com/ckupload/files/84943219836.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/8879146356134bdb0c6c38.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/wumebekopebatefebe.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/begufebud.pdfIn PDF document text
    • https://filetorme.com/upload/files/julesosuz.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161446d3f858db---44002734756.pdfIn PDF document text
    • http://usmleworkout.com/files/file/31895752551.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kodanexivuzixiladonis.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/xovatevojujububuwexefo.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakajenoli.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/11280893269.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/zamekupakimaxofozozaka.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/12177503941.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/pevaberekokexovugikoxe.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/1355868860.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazun.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gegedopirilu.pdfIn PDF document text
    • http://rapet.hu/files/givalulujil.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/popedefasog.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/supezumaxewatawijajumomim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=thea+stilton+and+the+ghost+of+the+shipwreck+pdf+downloadPDF 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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 11040 bytes
SHA-256: ed602accc8756e3b5072b97a49734ecb96df8ac8a217d04a59a86ca2ccb8367e
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 19956 bytes
SHA-256: 51079afc604f4cd05066d916e6a20d01bfdad20b85dca29ddcf08ffc4d667b33
font_02_sfnt_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1