Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef345f6b5661eb0…

MALICIOUS

PDF

78.4 KB Created: 2021-10-10 19:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 340ed207e5f7433ff4bcea81d9187345 SHA-1: 4ee0e953a8f96c1987b10a7393b8770dba16e40d SHA-256: 2ef345f6b5661eb0a979bdcf040d1ce0a0bb361dd65f3368bb703020de9851dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The PDF's structure and the presence of many distinct hosts suggest a tactic to evade detection and distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=by+their+fruit+you+know+them PDF link annotation
    • http://vdadanang.vn/app/webroot/assets/files/zazafalalafuwami.pdfIn PDF document text
    • http://distributoram.com/files/file/vonegepatibilepuvolaxum.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/16983812452.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/35216752733.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/6818818244.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/jomatusegefose.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/buwebixedasawesubivopum.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kikinogijaxedutikal.pdfIn PDF document text
    • http://charivne.info/images/file/88884405376.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gorusironof.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/26524452653.pdfIn PDF document text
    • https://noventa.cz/media/files/file/33020075544.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/sugasomaniki.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202110011452097457.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/19680052205.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/fonudeximimiked.pdfIn PDF document text
    • http://standdominica.org/files/files/gexiteb.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/xomupebagekajofetamobes.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4d52b04fb---gonatolibimekirirovepori.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc7bba874---11838379922.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/fatelowoze.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/34001442191.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_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 19280 bytes
SHA-256: e0218421619790faccbe60e5cace5ebe3f9ffdf4094d6c16ca13ec958df62d99
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 10548 bytes
SHA-256: eb3c0d40c573b9dee3fbce2b4f80755ceb8348ea1e5896bcf1c6ed9c14ea91d0
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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