Malicious PDF — malware analysis report

Static analysis result for SHA-256 603427acf7e7a07e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 12:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 629981bd36083fc36c396f42d4e1e002 SHA-1: d4c43b4b0db11dedfad1b3048f89b36fb7eb6a5e SHA-256: 603427acf7e7a07ed1fb89232e114f0048f002a4fa674ec000a502869cfd2aa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The embedded URLs point to domains commonly associated with phishing and malware distribution. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=friends+series+watch+online+with+english+subtitles PDF link annotation
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0a1e88de---91299662432.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/44860889284.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/zakefoburetunaleto.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/ketozusew.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/66578964755.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/11385166056.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/libasegoluvemok.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lerosixobavamanefomu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/xewovewuti.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/napubo.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109131907432465.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gesatolonizaduzarebuvaza.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/57553359475.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/44465847812.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f172fb36c9---22558260663.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/65035026266.pdfIn PDF document text
    • http://sial.pl/galeria/file/95861385059.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tezuvusaremofuteditevi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/ridotidodupaxakotazutapar.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/15218760833.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/divobodigonubutolavug.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/92059154416.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/mogofawo.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109092120523718.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 10952 bytes
SHA-256: 95ce4a49096ef951c4227ffe6ff40177deffe129951a5284090130858aa7354a
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 17996 bytes
SHA-256: 2000c2bcb601f12e53618545b0d7a5f0b1802be68bd61a34c8126f0a367b12f9

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