Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5e574d959557be…

MALICIOUS

PDF

75.6 KB Created: 2021-10-04 20:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01a67ab28607c23069e363633695f8b1 SHA-1: abeef1ab2d55ba9276aeaea9e631ddd7bd99c7e8 SHA-256: 3c5e574d959557be6c5594545f17b1a9e0662d877c9042e718684f0f14f3543e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains and appear to be part of a redirection scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest this document is designed to lure users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=daughter+of+destiny+kathryn+kuhlman+pdf PDF link annotation
    • http://dvg.asia/ckfinder/uploadfiles/files/gixonewo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nefobawimumuj.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/mebegerunivadaxe.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210903055305.pdfIn PDF document text
    • http://kgmda.com/upload/files/mifadu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/rixubovew.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/fivenifenomujedore.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zezexozadaluredimizota.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/siwopo.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vuxirikezekoxifufe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/80528373412.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147ada363bb6---mutuxegazigenuwatanorux.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/1425308995.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb32ea187d---jerupurazuxuzumibujas.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/92014832841.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/bisabok.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/wolovotab.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/57257638361.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/83970398057.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/13926678681.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23709963198.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xadawidugigomilivinuvurad.pdfIn PDF document text
    • https://egca.fr/userfiles/file/livofiwigexomolupumeg.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/domijusafojemexir.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/39932821446.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_off0000c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CE 11252 bytes
SHA-256: dd01254782f934021c610d8be61188204ef62ffa9e4735778ae7eabfdb4fc6e3
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 17232 bytes
SHA-256: 41d63f6f3dc45b24d501dadc6b70ef38cd6f72ece9883850c7fca77176dc396e
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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