Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a1c9889124f690…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 05:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1013c50797d13c058de4e23c8deed02d SHA-1: e611373d4b2be9a445bbe21de52831dfb0f52d37 SHA-256: e8a1c9889124f690f8742d9f726922f3d645043e368adf938adc74252bc7f5f2
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests an attempt to execute further malicious code or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gardensyellowcab.com/admin/images/file/97202752605.pdf In PDF document text
    • http://www.urbanwaterways.info/files/97946337914.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/26241501453.pdfIn PDF document text
    • http://pactolous.hu/upload/file/19223616654.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/ximevuwajenib.pdfIn PDF document text
    • https://senegal4d.com/contents/files/dajopi.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/34611682461.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021926_95952_915.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/93852911031.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/rajujadalegajafiwategev.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/vuwabogejakok.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gamafumevetobojuta.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/goxipexa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b30f032cf---kajatubekuri.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137703f69c59---pixek.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/xeligavun.pdfIn PDF document text
    • https://sambelteri.com/contents/files/nigezewax.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/85533832787.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/78236766066.pdfIn PDF document text
    • http://metabolit.ru/files/file/tatuwufiwiwodiguzi.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/19973137126.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/bepuretexonijizoxot.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/bipifatanigedawumoduro.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/15155182535.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_8770BF1A6E7ACDC7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=arabic+grammar+book+in+banglaPDF 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_off0000af8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8C 15140 bytes
SHA-256: 76d9be149d01e7f6bdecc2902fcc78d4b9761325623141709776a7a152c1c5ff
font_01_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10388 bytes
SHA-256: a0dac4b3f60fc47a9a44df281f471741e1cdbbca48c6d09f4b1dc15a5df4dc6d