Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ace1473c971e1b7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 21:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b046d6307fdbe0b757b5ccc0fc0c660f SHA-1: 256f8b0f91a32e82620b22a4e73458e45be2d8be SHA-256: 3ace1473c971e1b771d70274d8101789a2c0926de0a4e1d7c0734eb80c71ceb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=rhodesian+ridgeback+group PDF link annotation
    • http://bbbo.handyfriendship.com/upload/files/vimodug.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/75483609155.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_B2FB0984FD99FB63.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/39542547516.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/jazeg.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/popewefegikusake.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/89897298923.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/fumixogusojure.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/pupitirajavobe.pdfIn PDF document text
    • http://quetthe.com/upload/files/2178276509.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/redade.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/84995261961.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/70268779869.pdfIn PDF document text
    • http://plncse.hu/php_data/file/74751372008.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/23/nefebonekesa.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/29197249323.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/ziratonarisasupu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/kegoxa.pdfIn PDF document text
    • https://laps.pl/userfiles/file/59923826216.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137307312045---demadim.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/98286496124.pdfIn PDF document text
    • https://priscar.com/documents/files/78183543096.pdfIn PDF document text
    • http://findusafranchise.com/files/files/nokopegidotofurepoto.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///peposuvi.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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 11028 bytes
SHA-256: e637f7c751091ac7e8de781a4a4d7dbaf6209d199e4378326d29dbbc55b8e1b7
font_01_sfnt_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 15388 bytes
SHA-256: c8f0371fd85379f9afdc46bb2aad438f4d3c3b302c7e24c00d14fdc2bc46fb8e

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