Malicious PDF — malware analysis report

Static analysis result for SHA-256 c136c15e4c5a35e6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 06:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8eddbd1706b6a2a638b345d6de29806 SHA-1: 3f5577153687a2a602097eaba9459d61b43bfe68 SHA-256: c136c15e4c5a35e6dde82166f32a94469fdbb551ede51767993fd53e308bed26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate a link farm and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to one of the numerous embedded URLs for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ctyrkolky-gamax.cz/data/dokumenty/renuzudozojarerase.pdf In PDF document text
    • http://www.painters-restaurant.com/userfiles/file/tibuletixeduwidi.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/lawivopisuxavoxa.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/pifafopezeropuxokelogaze.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/zuxefilobatarusaj.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/8144122638.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lijonakobaw.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/61692608704.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/rikivenaxu.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/gebososo.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/xufimozizesozupokevivuka.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/fulitawejofilojilupag.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_0C7FF4A698A2C963.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68379734439.pdfIn PDF document text
    • http://cissi.it/userfiles/files/nuduzebale.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/razise.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/79891228190.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///jokemodipewime.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130465d3ac56---fulajefafafomarexonul.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/72001534304.pdfIn PDF document text
    • https://onlinendttraining.net/files/fonukewilazetomosax.pdfIn PDF document text
    • http://www.polni.si/Images/files/5644453844.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/lixogisumokiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=3+week+diet+meal+plan+pdfPDF 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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 10524 bytes
SHA-256: 606a7bad9e62c0026e0c467d72282b30e940645d7d63a33699c8fbd4de386634
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 17876 bytes
SHA-256: c406c62335ee28818076e7d44ad6576d339e72a34fed3c30ead856fcbe51db12
font_02_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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