Malicious PDF — malware analysis report

Static analysis result for SHA-256 65070b3d6409aabb…

MALICIOUS

PDF

76.4 KB Created: 2021-09-09 12:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5161a68d0f380d1b42129e80702ba637 SHA-1: 81869b84617e06ccfa4955c103020e1d692bfef7 SHA-256: 65070b3d6409aabb5af23a706f1111cb1a4212c6fa0745f8d2a522385d231e6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://drafthe.ru/uplcv?utm_term=reproductor+ipod+para+android PDF link annotation
    • http://thanhnienxp.com/vietkiendo/upload/file/libuwunuvuf.pdfIn PDF document text
    • http://toonesk.com/upload/12725332923.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/jajipofotuzijitenozaporo.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/20356682195.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/pejibimarejud.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/wipatinixogesidex.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/19601987594.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/wofafatonilir.pdfIn PDF document text
    • http://iwort.de/userfiles/file/79305197152.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xometexurewubigapigoteso.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/mopulewasof.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/61870511440.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/56320337295.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109052334367344.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/43570077901.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/wugozo.pdfIn PDF document text
    • http://lovesenergy.com/file/91015133860.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/rimuserawejega.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136bebc139d9---bekimoguwubedebe.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/75477242886.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/43598612947.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/moladamogefi.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/50670931293.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/32484744633.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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 10440 bytes
SHA-256: a7d8fd2ee1821b74321991c937de71931fe4acff46037a97733e2e9f64cdc381
font_01_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 18308 bytes
SHA-256: dec7a83a6731f1d9edcedcdcbd46f62e38949052d531a4234e3938ab54d631bb

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