Malicious PDF — malware analysis report

Static analysis result for SHA-256 426566db16db4513…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 18:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e990ddfe9c07f18cb6214bfb08dad01c SHA-1: 609aca045710eeee295ebaba3f7326e6d62fb9f4 SHA-256: 426566db16db45135970e858600a82e7a18e45b945ab579699defb2ba44cb410
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document containing numerous links to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of many unknown URLs further supports this, as they likely lead to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://xn--49s538bo8ux8c.net/userfiles/file/91430696878.pdf In PDF document text
    • http://darec.sk/files/files/gozuruxanipa.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/welerinawixewuzirelukig.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/bivowafomaludotuvedujili.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0480531e0007e4461299ece7d4a797be/segipom.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/11376647051.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/21242078217.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/fotulimomuwife.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/22858819712.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/40886083711.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/12463116453.pdfIn PDF document text
    • http://africareview.in/userfiles/file/97881688880.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/64686916098.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/ponabase.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/22383995812.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412b695679d---pusaxonawufabimowijuf.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/96161712499.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/puvinep.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/latedomigagadolelopefej.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/38539714554.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/sugokepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=principles+of+consumer+behaviour+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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 17320 bytes
SHA-256: 8ddf1b184efeecd39f01f3f4eeaa39d42d300b9c43b62262d3e48dfb7edb4614
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 11096 bytes
SHA-256: b828c2fdf99d2d588b6378254033e5a98f596f340e699d0c5923ed095a91c809

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