Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5b0ba9842b92b9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92f15e9d0865623d5b50f869d0df089a SHA-1: 7bba61db6809ee960697ea4c795f14c1579962aa SHA-256: eb5b0ba9842b92b972f4b00e62b2e2c33bbd2ee0a4fbd95cf7a2e3bcb2edc7e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of `utm_term` parameters in some URLs further supports a phishing or malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://catamma.ru/uplcv?utm_term=frontrow+premium+apk PDF link annotation
    • http://qcfloor.com/userfiles/file/gavubegekikinolodotine.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/50082757821.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vulave.pdfIn PDF document text
    • http://fohow77.ru/upload/file/poxojifinefimeno.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lnbtic0tiq3m5bg4dk6lellr79/kovepejabenesuga.pdfIn PDF document text
    • http://kant21.com/userData/board/file/20449340403.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/fafelelagevusaka.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/fubajezefapanemesijedatun.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wifozivokifuwixusis.pdfIn PDF document text
    • http://pileki.com/imgup/file/84211380662.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kibabijefababekisagomi.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/58423146345.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/pamagedut.pdfIn PDF document text
    • http://geoman.cz/data/file/gizofamor.pdfIn PDF document text
    • http://annabarons.lv/files/files/vimozape.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/kubutekepafudokazipeje.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/11737716470.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/20652681047.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/wuxupovuvepigelojoku.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/68221074573.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453834594c5---xusufiv.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/rutuboredobizazanuvasalu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/69100368462.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vasurozonudaxilosetibo.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/95001307375.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210917025600.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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 10452 bytes
SHA-256: 9abb86be84785ce9121a422a641ab56ea7c174fc8de0709e8bd914ab33bd7432
font_01_sfnt_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16584 bytes
SHA-256: f7aa9af7dc6e3c7fedb24d57edbad38abd45d2211993e9f967fdbeb02c6186b8