Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2987bfb82ef719…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 15:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbae561cadd166273a8605506bdae9ed SHA-1: 1b98af80a38fd492640b7273f7bf4ac6c1fed43a SHA-256: 4f2987bfb82ef719552a4676fa4bd319e6b00104dc2c8f8d4c565dcd6e2b95f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of many URLs points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=torque+pro+on+android+auto PDF link annotation
    • http://yuli-china.ru/d/files/19166969498.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/85310433050.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f69e68d1a---75067580706.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/81332930335.pdfIn PDF document text
    • https://ratoempat.com/contents/files/xanemajifezujijelux.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/wevawopoxosu.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/woromixelovagimabulozek.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/35707530826.pdfIn PDF document text
    • http://boki.hu/editor_up/34446224421.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kupuruvejumibusoxi.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/18171400640.pdfIn PDF document text
    • https://deepex.hu/hirek/files/minakepifigakavovowasu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sugeguferigelero.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/kewazisodekinakuzejawipup.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/51553935446.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/lakiwubekekuxopaxa.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/dufukegaxidupod.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/duxogalanenaludogukafano.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/19870811418.pdfIn PDF document text
    • http://www.bash.cl/media/file/pexirarirazuborefopeme.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/19730498143.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/rozefexekadibanabawe.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/80806612594.pdfIn PDF document text
    • http://harlit.com/upfiles/file/39138513618In 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 10380 bytes
SHA-256: 3cc53a8bd5afbce2ab799fdcd1e64e5f325a6626c19677412e991f997b26ce91
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 17000 bytes
SHA-256: e51bd5d84b18166431486fbcc140d4b88324919b3f911f3684eff8c204a4991f
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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