Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4853babe7d61816…

MALICIOUS

PDF

79.8 KB Created: 2021-10-11 23:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ade03a9a70776f2b3cd4564136748cc SHA-1: b7dec8155a749c0a6c0b545bfd6a6c0ab5e69069 SHA-256: e4853babe7d61816892947b416e75064e7381ddc3f00725529b275979e8bff8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=website+footer+examples PDF link annotation
    • http://manilag.com/FileData/ckfinder/files/20210921_371175D0FC2B768C.pdfIn PDF document text
    • http://iviltra.lt/images/files/sigarasiziroxu.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/jolavajetesopabumalifa.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/58693109941.pdfIn PDF document text
    • http://brlairport.com/images/file/roxoten.pdfIn PDF document text
    • http://vning.net/filespath/files/20210904214248.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137b56da9a9d---29855110421.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905081756426720.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/65928052102.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/pomojituto.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/42460064399.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/20059778106.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/motuxabujifisijugawunu.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/26219308259.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/13038525071.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/gafarivoxubepelitema.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210923032031.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/tejike.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109191647477868.pdfIn PDF document text
    • https://eventaipei.com/upload/files/falavatirejarogawogakixul.pdfIn PDF document text
    • https://marosme.ro/hirek/file/59816682813.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/6167563096.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/94610737640.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/68371297349.pdfIn PDF document text
    • http://bienbao.org/uploads/files/reparakomeg.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/minimetukixesexi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c665b330e---wusonerizimisibarun.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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 17924 bytes
SHA-256: 9c62d909a6511e55dfee1f4242f1edad327898f62aec6c6c6a4b1bfda868c89b
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 10652 bytes
SHA-256: fc7241beed54fe26bbdf39fde4e33057f9a955d9b6e4cba5c8981b3c20a47d3c
font_02_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1