Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc591b58b86202ba…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 01:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdd15f566ec20a87108663aca6b4a59f SHA-1: 5ed855476f6ab72b6b5d7f78221518b54cc8ec88 SHA-256: dc591b58b86202ba503fa5e47d66a2cf65df19f59427fdb06eb97423bc43dd50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a probable phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic findings strongly suggest malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=riptide+violin+sheet+music PDF link annotation
    • http://geonatlife.es/ckfinder/userfiles/files/kojum.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/molowesuborukuzobemuw.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/tugagopetezotazipov.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/35591507690.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/94592157865.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/36034384663.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/xavigiz.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/xusoxopukik.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/43331179586.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/palowiko.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/59368232542.pdfIn PDF document text
    • http://potya.com/43226334839.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/bibigepurojesal.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/59078534356.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/selokoderesisiluza.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/42874785026.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/82311976739.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/28067227469.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/ramala.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/vateranugelowu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a50fb10fa3e68b5e2633baabd634a2b6/jazuzebepuvuwatevon.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/200a315cfb10074c318ea47ab311725b/gizinep.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_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 17256 bytes
SHA-256: 007934155ff6922f6f66ab682706b532b91c492ebad17d643813b7af54c1ea8b
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 10728 bytes
SHA-256: 32413b14cf79eab978c3fc085f52c9fcc98dfeafd7453c2a2c7ed5ecc075403d
font_02_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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