Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1da420fe6b827f9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 10:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7226f5a132c7aa224d83e5321f41c531 SHA-1: 56fe30f8b4695b97cc614678a6f2b205cd55e572 SHA-256: d1da420fe6b827f92bd140ac8d5d6644ffc742f9efd97125607dd952f64f79e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or content-luring campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/1696562530.pdf In PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/18510636584.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tusa6nu32v5117ji8lrc7emt02/wujinaxi.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/95782931037.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109052316248562454l1ugegnv5n7.pdfIn PDF document text
    • http://relans-nn.ru/images/docs/file/xolefikusalewobag.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/91645056472.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/togixevafavuwibaratolopib.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/66357917926.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210918102402.pdfIn PDF document text
    • http://3sdent.com/upload/files/24311883021.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/62404202556.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/tefolurerinexomiton.pdfIn PDF document text
    • http://acril.ru/ufiles/files/40901459708.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/nosaxixugozefuk.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fabitukipimofitemigete.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/1403761511.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/97744427606.pdfIn PDF document text
    • http://kasand.com/userfiles/7196799686.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138401da8d72---siwenajitukikuf.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/11121792879.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/98007106401.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/38853431827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=thop+tv+free+appPDF 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_off0000bf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 16252 bytes
SHA-256: a4ba3201a55b6d847b83b34e46f9981d1ebb811ba77e096156a2154299eb5421
font_02_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10076 bytes
SHA-256: b17724e6b57c4297f36bfa4a07372999729b666c00607afc3c5a0dd02444d6a3