Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3871d03bfff8da4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 13:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8fe7dff17cd854c8865e8ee9fa41ebc SHA-1: 1ccaca766eebed1dbd72b891becd2957e92f185b SHA-256: f3871d03bfff8da457f141d63c9636aaa7427aea94109d8e0a80b7fdf760ecb2
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting it's designed to trick users into downloading further malware. The presence of many distinct, disposable domains further supports a malicious intent to distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=wifi+hacker+ultimate+apk+download+for+android PDF link annotation
    • http://dexgerm.com/data/file/userfiles/files/82590393747.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/26006282886.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/27073077143.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614539ea19b82---pozegijudejudalivabura.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/sewutiwilozalunekemizubu.pdfIn PDF document text
    • http://stonebreaker.at/gusubuxebuxoxewifasukekir.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22685919138.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/nupemad.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/23993033114.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146be678a394---sabipijufamikazesipajuvoz.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/40331670649.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/xizosum.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/27078981811.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109121302374618.pdfIn PDF document text
    • http://upakuika.com/img/file/30114211821.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/53613598431.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/zufimagifivazaxo.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/momasoxu.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/xorulazanexonatesot.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/73719346367.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/21726487300.pdfIn PDF document text
    • 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 10988 bytes
SHA-256: 7cd8ace0a7be856e282fa8ff296dcb94ed9a8c92f068592b8a24e0eff6363702
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 17552 bytes
SHA-256: bf00eb4ca3125ba796a8c9aa71dadaff28b43f625c7b6d29cb2acc7ae278347d

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