Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88e8dd5880234b9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 19:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea0eef76c57178e19e08aebe6b078bfd SHA-1: d1b88ff6f5b7400203c686e3aada8773cc32cfa7 SHA-256: e88e8dd5880234b9df09334352d8345d2c38bc0ba8eb4684c4d3be32cae07ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=the+last+olympian+read+online PDF link annotation
    • http://tomboy2.com/images/library/File/74683634373.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/13569142960.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/21763003746.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kipevuzajibavorajeropori.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/jodezurudasobenuxudejuki.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/gakiwuvoxudoxuxepulefuf.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///43903627437.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/57159761977.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/49682165374.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/dibivog.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lubulijo.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/dixunuxufiwom.pdfIn PDF document text
    • https://songhong.info/userfiles/file/resirujamenofojisozejaba.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/setenem.pdfIn PDF document text
    • http://temple.mo/userfiles/file/9338327599.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/98812846784.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/legolex.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/54830297138.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/vifimipupuvukepov.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/64201394939.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161329888e0392---94257956378.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/35313333642.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/wukajogonibomu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/gudenujopebukub.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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 18084 bytes
SHA-256: fc9f25f76c9e9b02ba25a0634084786720afd180ade872dde0f871274dd625bb
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 10732 bytes
SHA-256: 5517950973c30d663729be210fb404591f946b68b67a157331422d58efa8d4c9

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