Malicious PDF — malware analysis report

Static analysis result for SHA-256 bede0b2037683ff9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 08:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d893be4a8ed7b712a81f8013b021bde1 SHA-1: 28b35c29114d4ebc443a517e703bdbe380f18cf4 SHA-256: bede0b2037683ff926f12acd81da0120a1a2b410abdbaa886a4c36a6926a3ede
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identifies it as a link farm. The presence of these links suggests the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://indianmailbox.com/assets/images/userfiles/files/pipezozusetuwawo.pdf In PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/razawivanizudoli.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/83314745061.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/kamarelaxiko.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/37574500077.pdfIn PDF document text
    • http://186086.com/upload/files/levudufivika.pdfIn PDF document text
    • https://peterdegendt.be/file/mavovujowoz.pdfIn PDF document text
    • http://sentai.cc/data/file/20210912_070425_344.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sisumanunagofaso.pdfIn PDF document text
    • http://wohingltd.com/userfiles/miwigaxuwimapejil.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mimeb.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/44596542161.pdfIn PDF document text
    • http://patroha.hu/file/gavagobanuxupilufemone.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/fusanupozix.pdfIn PDF document text
    • http://someteme.com/archivos/_20210915075009.pdfIn PDF document text
    • https://ntc-container.com/upload/files/11155605392.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21bb4b115---40072219977.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9cbd52b5---nivokekolusi.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/3868887987.pdfIn PDF document text
    • https://congchung7.vn/upload/file/91700142075.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/womenozuril.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/34907702865.pdfIn PDF document text
    • http://belean.pl/userfiles/file/fisaxetajupereriku.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67779262450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=play+play+game+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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 17028 bytes
SHA-256: 6f1197bf860b68f43768a625d349e7865a9ac90c1e8962d375423448fefff427
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 10480 bytes
SHA-256: ee7d8c1553c87e0719d4bdb0ec43d35bc18ee49e18b5609211d85744684b3d65