Malicious PDF — malware analysis report

Static analysis result for SHA-256 7584d41dec890616…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 13:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16a705e8547158e72271a5bb13809834 SHA-1: eed0dee545dcf671e984f3a15f835c7dfbd5e088 SHA-256: 7584d41dec890616929b24e73c3fba307889c1de091619533dcd6f962e9c1c01
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous suspicious links found. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan-type threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://chcial.ru/uplcv?utm_term=recover+deleted+videos+from+mx+player PDF link annotation
    • http://mertcelikkapi.com/userfiles/file/60954339004.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/25916082729.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/12510833899.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/lobufobuwasegigow.pdfIn PDF document text
    • http://samtekelektrik.com/files/97314710242.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/56171805883.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353ae496b29---pifanufenedawoze.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/39919657133.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/xufitujoditinir.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/79861682117.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/59875591476.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/66884314518.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/tapoxadit.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/fiwuw.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/xudetefikobux.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0d075c77---sozotovusatanofosedulu.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/19135112663.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/82894964179.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/bubawomenutuxinenasojel.pdfIn PDF document text
    • http://unseretochter.com/images/file/rolajusomogibegonud.pdfIn PDF document text
    • http://limoride.net/gallery/file/jawer.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/baxodelewasunidemaxujela.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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 16928 bytes
SHA-256: 9a7e71ec9f11d745d8af8f9051d39286dc924fd7545d2b31fe6a0c3fd0a907b6
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 11004 bytes
SHA-256: c1b8a8c6d49eaf094b49297c53517a60dfef724190c0694876d74d3d11aa0966

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