Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4b9193f4e95326…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 00:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3d84098255c987cb25ee34545bd96f5 SHA-1: 35a2f4c4d28a8ed3880342bc30589a3e6ca7c6d2 SHA-256: bf4b9193f4e95326094314abb63d8f7d3a51a8efd55ecb9bb61bd03a2b218d36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Numerous external URIs were extracted, indicating a redirection to potentially malicious sites. The ML classifier also strongly indicated maliciousness. The file's purpose appears to be to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=what+is+arrow+on+top+right+of+iphone PDF link annotation
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/mavulajogojawewulo.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/vaboguxawe.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/manajojokoxarataza.pdfIn PDF document text
    • https://km2804.com/ckupload/files/zojod.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/kiginapetamo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/36895669672.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/dilugomituruwamaru.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/xatotoxugitojimonali.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/78766407788.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/37660957708.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/bupesuzutalisegute.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/84745331371.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dc3f492a08dde11c138fe7255bb0a90/80365204518.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/xowevituvopomufemumibarod.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/nitesexotemamuxafirepaz.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/4515328540.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/92142974504.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/desumobate.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/69382853490.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/29305660131.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/49f9b2f479a9f5f64eb1208bb9c3aca8/8743235740.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/80059612198.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///25174011284.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_off0000b098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 15896 bytes
SHA-256: cd25fb6191b9ce3df01ec31b0e99c5edd091752a333161de3a3b1aa94ba966a2
font_02_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10672 bytes
SHA-256: 30e9ebd76dce08846d0c3a2614a658b7bec800a44f5ecb0b16ea8486f76f10fb