Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1951f92374cbe6a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 18:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce328c9a82bc6aaf96d61c866853f842 SHA-1: c0670c0a81cff7f9f966c49f9832c1639e4d2e7f SHA-256: f1951f92374cbe6aba877544aae0505f4b1f49d9ed6474153062fb4547e66df8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on unknown or suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://razredna-nastava.net/files/bulejoroxurezofixi.pdf In PDF document text
    • http://delve-cr.com/uploads/50767253853.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/9861197165.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zurokodugizowidamanifeko.pdfIn PDF document text
    • https://costarica4d.com/contents/files/sajilaminemamase.pdfIn PDF document text
    • https://badrivishal.com/media/56594153318.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/12221848269.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/52378656253.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/11448508308.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/602d8346402386a4eb77c66edd090afc/fepamejetutawimob.pdfIn PDF document text
    • http://gewald.ru/content/Files/nugewetiwetesedukin.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/53402250246.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210901_6020E6BBC02466C7.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/900173481.pdfIn PDF document text
    • http://blccy.com/userfiles/files/garosawelives.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/42050524311.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/tivubelide.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pijawesiwibojixetuside.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163058477918.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/buwazulug.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/mugibifirogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=schema+di+stato+patrimoniale+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_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 10960 bytes
SHA-256: f8d5275e5aeb3a8a4d3580580018c54fb7c7f4863869c206588f4327d8f8b591
font_02_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16508 bytes
SHA-256: 5f36766a3c39f7746f83b9ab19d41b2307995720728547381f2ad57094731109

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