Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b001c7b218a05b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 04:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 466af4f4af51b4382c7f4190f6d6d691 SHA-1: 4dba118533465152cd0a5fd16818feae37aa5a1a SHA-256: d3b001c7b218a05bce7e10fed3278fe80d1df499ca4fa3f32a6243c900771c2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URIs, suggesting it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable domains for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • 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://wastran.ru/uplcv?utm_term=inductive+thematic+analysis+meaning PDF link annotation
    • http://fruhmann-elektrotechnik.at/63905304062.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/sikefabunudurefojuxoga.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/77932587085.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/85377481354.pdfIn PDF document text
    • http://letdentalab.com/img/files/38724042785.pdfIn PDF document text
    • http://espokebar.com/uploads/files/2824786587.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/40012550579.pdfIn PDF document text
    • http://hk-keber.de/images/file/66464163446.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/46948025766.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/wumijaruzegatigufesemelil.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/28015960966.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa877bae6---rogasopifarurosagebugati.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68465034470.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/95475278391.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/94112657645.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/fidodorefek.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631358339.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/gomazirizisagiputato.pdfIn PDF document text
    • http://bdnchem.com/upload/files/92561350643.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/20021981559.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/bakunipekawerufamu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/powigorudagete.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kadevelologaj.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/72067134624.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348d5376f4f---95140398894.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/1086517767.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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10828 bytes
SHA-256: 36e5de9ed4c7adb3acc8a7818bfa8daaf71d7090e58dba9ae31721428864b546
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 18428 bytes
SHA-256: 747079a9e21358e6cfe24a6eb44d34038cacaab3e5e65cebf99136fdf7be52a1