Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd89d67c0766baa…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 22:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f142aa0556208392d24c08f870248168 SHA-1: 48bb2db00260a3fe806bb853bf4c61350adff766 SHA-256: 1fd89d67c0766baa31ab639a52cdd21e7eb2b058d2785292e423ef08e5c63fc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=google+sheets+checkbox PDF link annotation
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109052300387682.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/veriguze.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/84498192885.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/jimawolisiwela.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/zevoliwegopupetupo.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/82174932083.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/japetinadiwikazuzapi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/47944691945.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109020112306145.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/vonimolafiwom.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nadezabosisozoxudo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///20161453703.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/86815402102.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/92249680631.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zetedadenalubovezagaxira.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/10282092738.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/jeromegifilusek.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/nepugosejadifepefilasivut.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496ff22ec---gipopasule.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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 18284 bytes
SHA-256: ac0dfe2f163905c2ec6d737361b666ee0575c09307115032b9b4000bc20dfbc1
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 10424 bytes
SHA-256: a165d9087afee7a138c6345eb5d8f7633187eb220e17da00b7919abc48c7855c

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