Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18769504001c4d2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 20:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 033329d395241f683ade13c56b9d5ade SHA-1: 07e20564f7aa332f353e7ece70c9821a065d24c7 SHA-256: b18769504001c4d29b7af933083a7acf6952f1a7ca70f4811bcc7b97ef191942
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://amidoux-peintures.com/ckfinder/userfiles/files/10509828132.pdf In PDF document text
    • http://e-instar.com/userfiles/file/46124906824.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/18172878694.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2ed7e5f26---56824569608.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913082907.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/goferonuwajexobokuzedevub.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/12334881082.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210906162052.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/bopizelivuviko.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/77351409677.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/vuvixogeparovede.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631031184.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/bebibamowikusafamofif.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/boledoberowaba.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/3116236386138257760643.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/minadir.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jujovifibadinaku.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/jadaxe.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/5793006970.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/lanibapixaruveduju.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n54ejabblsotk4gh50v69toqms/gumonifunetanexuse.pdfIn PDF document text
    • http://merwepizza.com/upload/file/nowitubiboloxafip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=among+us+online+game+without+downloadPDF 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_off0000b040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB040 10760 bytes
SHA-256: ac2f7c6aa1285e686985d5b730a7da0d6202181799496c73057013599ddbb8df
font_01_sfnt_off0000c8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 15908 bytes
SHA-256: eb9dd80f6e33d62a4c3fcaffccd449f0ab2c5d272eeacd872fccc1d02e9cfd5e
font_02_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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