Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e0495e9f88a600…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 10:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 014ed860d66d3567e2b1cc3940434e2c SHA-1: 4d8c60b48c26cbc8f87145e4c6339a8755d43724 SHA-256: 28e0495e9f88a600e81a92fbec371d416900a32dba33c77db2d7e6f4869b3aed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=develop+android+app+and+earn+money PDF link annotation
    • http://spostojow.pl/userfiles/file/28821966271.pdfIn PDF document text
    • https://gilbertems.com/videos/file/leramevozimaxi.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/43327959097.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/74295958937.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dozujasubakene.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/dogofirowerajizeduzi.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/22154345571.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/92718617191.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/93564242626.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/10828474331.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/rugawiditafijogamuxuxi.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/82563037265.pdfIn PDF document text
    • http://zzquansu.cn/d/files/logelivunomuluxawewom.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92250553284.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/lejakuxe.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/90688197649.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/numefemenetifusuvomawut.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/losepakujimanedoboxodil.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/bidexapamarujejupa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mozuxunadewidivu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161360b9dd3f7f---wogavimovutidakigeluvu.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/tojuratekasipakuzuwe.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/bokurimafetisofipe.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10468 bytes
SHA-256: 3932021787ac2b058d30120f5554ff9f6abdd8068c6cf72086da2cb3d19f41b1
font_02_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 17036 bytes
SHA-256: 793c85d7fa7c4126424495fe6674bb9d6e7955fcfc7a32a2d7cf07eecaf7e662

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