Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c43113b872238be…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 13:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a7302c0f29b8d99726c202cdbb0a396 SHA-1: 3966bfe326bee28a973e020eaab11d33256286ca SHA-256: 6c43113b872238bec433d210d4e2bec754f8096f52cb0e65db5a329a0e1dbc61
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://beauty214.com/uploads/files/202109072253118695.pdf In PDF document text
    • https://rmp-familienanzeigen.de/cms/files/tekegemizuj.pdfIn PDF document text
    • https://tigaintan.com/contents/files/96938181246.pdfIn PDF document text
    • http://airmon.hu/images/files/74400578562.pdfIn PDF document text
    • https://coluer.ir/documents/file/18488104576.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/dofer.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/32623674644.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/60904937435.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/tusufitagox.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/vepojasivexogiwabad.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/dopavuzodetagumekuzino.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/nogojijirofelirulagu.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/53492144603.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/71573964612.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/bosujaluvakusaraw.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/73686785062.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/45246466110.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/63040331300.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/83457641257.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/36112963952.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/78432757751.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210911/file/lotivotutoserukusaz.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614005e38cd6c---15137810474.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lotug.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030600397080.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/zebudafebejazagaruzapor.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/17628479922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dronningen+full+movie+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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 10684 bytes
SHA-256: 48bbff2e63ace80ea9e4834a31df831c2a227e586f1702d43b9f2e9079146d7d
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 17524 bytes
SHA-256: 88db3acea8a1cf9ca71ce103830a2c77f7a2b858471226cbaf738ed26253c098
font_02_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1