Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c188cf130bdd95…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 10:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af7381e9d2e639b46a38fc6b13ce5b0d SHA-1: 548dfd47d4dc1464e39823d86c7dfa04e16944c7 SHA-256: f7c188cf130bdd95efcb4da3b39a5f5bba346ec586e892cb50760b117af704c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a strong intent to redirect users to potentially harmful external sites. The presence of embedded URLs and the nature of the heuristics suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://crysiq.ru/uplcv?utm_term=mario+64+beta+rom+download
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/785839521399d421d7655a11a3edab22/99086449577.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/dusil.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/jufigeto.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/45268353990.pdf
    • https://haciendaloscipreses.cl/upload/file/migirowuxotono.pdf
    • https://bhsbeacon.com/FCKeditor/file/75510547673.pdf
    • http://apnm.indexint.net/ckfinder/userfiles/files/91307978430.pdf
    • http://gtlfuelmarine.com/userfiles/file/bogaxakulo.pdf
    • http://gmicropilotes.com/uploads/files/54811121771.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/fevanufotufevevig.pdf
    • http://www.binghan.my/userfiles/file/99615610240.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/sodikefiga.pdf
    • https://bluetact.com/ckfinder/userfiles/files/48149937402.pdf
    • http://andlupa.com/userfiles/file/ponexutavasibifaxutirer.pdf
    • https://alaqart.atelierleuthold.ch/userfiles/files/bigaponetanizosiresubodo.pdf
    • http://daiichilogistics.com/uploads/news_file/93077400198.pdf
    • http://lex.tj/img/file/gawol.pdf
    • http://autoscuolemontagna.it/userfiles/files/92575177105.pdf
    • http://ihdbd.org/upload/files/fopor.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/fupuze.pdf
    • http://studiotipaldo.com/userfiles/files/wegeme.pdf
    • https://tranthachcaodanang.com/uploads/image/files/47067324189.pdf
    • http://kirakuramen.com/uploads/files/banesosat.pdf
    • https://przyklejki.pl/userfiles/pexidemapurotuxekusopoko.pdf
    • http://tercovci.cz/files/file/48466656830.pdf
    • https://www.thc.gda.pl/ckfinder/userfiles/files/55774870001.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b60d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB60D 16792 bytes
font_01_sfnt_off0000ce1f.bin
f37dbbcf9930312d5cf0f2e145fff643e3bf64b2ceb02e374ca7e9e10fe90add		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 17280 bytes
font_02_sfnt_off0000fa41.bin
07165fe7c4eb3c6925fcbbd60ede9591379c8fae51965200b8276e62954ce6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 10704 bytes

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