Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6017374f3e5896d…

MALICIOUS

PDF

101.4 KB Created: 2021-09-18 11:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5e1af31afe74b3197dab010d76b4b0a SHA-1: e8ca0b1285e014186a700d47566fb8fd6a7b8a14 SHA-256: f6017374f3e5896d8fdb35bdffd695b065c994081e4b31bb7be05040f25b8211
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to obscure the final destination and potentially evade detection, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://futureinfashion.com/ckfinder/userfiles/files/vutiz.pdf In PDF document text
    • http://wronba.com/uploads/wysiwyg/file/fenijivad.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/17548889224.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/63314421034.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/10742915271.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/7863683535.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/vogimanos.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ruvafa.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/zobasidevigegaxite.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/41107876312.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/69036362670.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/18689745451.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/sebereg.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/jegikoriv.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/didulad.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/figenegovoz.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/jukid.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/91992678790.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/85343172290.pdfIn PDF document text
    • https://ivanamihic.com/files/88406608517.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/bixodanifipezefuleput.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/36818258482.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/bizagatokejasalivati.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jigelojag.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7e8aa45f---wobajozojutazarazerezebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=up+2009+online+freePDF 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_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 10340 bytes
SHA-256: b92d3a1c6edc130890d95f86c7794615e6bf7c7f3d3565ce78fb8b8c920dcfb9
font_01_sfnt_off00013fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DE 18480 bytes
SHA-256: 9efc11fbe89f61562ca29a23361d1cf628db944a7abb48a9395a1864441abe9e

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