Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0197dbf3c2616c2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 01:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e26c05c839cd15694989604d74d013db SHA-1: a8aec0608183728cfa71defd9b5ac00cfe657c92 SHA-256: b0197dbf3c2616c2e61a91a7be6f173569bb001c87b1f0dcf8a76202938c4979
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or suspicious. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://privatecambodiatour.com/userfiles/file/30248178063.pdf In PDF document text
    • http://prvugkh.ru/uploads/files/wuxefevoguvigoru.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/negetogumotivavubebup.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146593a5ebb0---vaxududizesiguz.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/lavanakanexezododox.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nurimalarinizibafotedi.pdfIn PDF document text
    • http://salespate.com/userfiles/file/gidanozadozopo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/2319270392.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613406388a7b2---70424443757.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/xujivemotimudifiwetuw.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/mipugom.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/53483192012.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/19826819525.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/94298340576.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/nisivuvi.pdfIn PDF document text
    • http://pasted-radio.de/web/files/99200564411.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/63663680328.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/zimowaxijoxejegaxis.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/32180621461.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/85434174852.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/rapugi.pdfIn PDF document text
    • https://shidoremicrosys.com/media/23030498880.pdfIn PDF document text
    • https://areicon.com/images/file/fofasikod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+remote+display+apiPDF 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_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 10648 bytes
SHA-256: 233458bcc48bb7c0df5abceccd1fb801238490d38d407c4a04a16ddb4ba36b13
font_02_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16608 bytes
SHA-256: 2cc80e55b11b6e81f5a0af4a096da9e9ff3a08a28f0d2bd14939a291d2975ff4

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