Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d51f0bc4eb2a89…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 10:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20e3632cfc7980e3a39991e21d7aef8a SHA-1: 8fc8933e0ca6a4d1aa13608daa6cc3f073cfa1ed SHA-256: d3d51f0bc4eb2a8908f5d052d11272ea105a8dd3c0c15c62591f56706f5ae14b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://krisoc.ru/uplcv?utm_term=android+10+emoji+ttf+download
    • http://traktor-tv.de/sites/default/files/file/37311912012.pdf
    • http://work4shop.cz/userfiles/file/33222670832.pdf
    • http://zjgjqmr.com/v15/Upload/file/2021912052572478.pdf
    • http://cocoal.com/uploads/file/29989312106.pdf
    • https://mitrasuksesku.com/userfiles/file/39695268655.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/66373522855.pdf
    • https://limblength-sldf.com/userfiles/file/79809957626.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/59389436605.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/6389579467.pdf
    • http://mgtofubbq.com/uploads/files/tukumutiviv.pdf
    • https://organicfertilizerproduction.com/d/files/pesinamezem.pdf
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/22915674768.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/02667f66177fcb31cb5365b823b0287e/darilexo.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/73410208636.pdf
    • http://ivankotov.ru/img/lib/file/29202194878.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149de29ea6f2---ranetatabudeluresarorenek.pdf
    • http://shardamedicalstore.com/singhania/downloads/file/77604123760.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/28861751974.pdf
    • http://polaryachts.com/res/wysiwyg/file/23766210628.pdf
    • https://cmoretv.com/userfiles/753441151.pdf
    • http://trivio.it/userfiles/files/76741489079.pdf
    • http://isotope3.pm-ural.com/uploads/files/38164377366.pdf
    • http://greenplanetnepal.com/userfiles/file/93430267061.pdf
    • http://autoscuolauniversale.it/userfiles/files/71213610886.pdf
    • http://ekvatorbl.com/userfiles/file/pugoninoduguziwive.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_off0000af73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 16792 bytes
font_01_sfnt_off0000c785.bin
bf90fb42444c5e39640465f9462ea2fe4a02546cd718bde0d6d36071d6050bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 15396 bytes
font_02_sfnt_off0000eec0.bin
b7c7761b50bebc1e8018a73e0c8a3982049c783959a16b5bf49d803a36995486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10720 bytes

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