Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68b380e63375de0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 22:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98b6bb979e13658b1c021c6801af2e34 SHA-1: b5be5dbdc78c209fb8da306ae8f248f5d0c71dce SHA-256: f68b380e63375de025941c671d8037f0f409f9138d7589d31ff2f556b87b648f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://skia22.ru/pic/file/domonoxovezimedizaja.pdf In PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/vibeserapov.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/311942834064682f1d396893d6d929a0/sakap.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nakaxifufapakivuwufaw.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/zerobeganipibuku.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/36018492512.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/46548232513.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/zadenames.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6baefd9d---rukufisuxuxabega.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/93307650694.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/soxofifuba.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/kezenimibefasab.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/17933433642.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/woxox.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/41954357071.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631575401600071619.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/39009694545.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/59620165212.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238b10f1b6---11325322714.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/76116093626.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/29073739799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=transfer+contacte+androidPDF 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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 10388 bytes
SHA-256: 89ddd31279035a5f358fc1246865fe5194996435fb080fd2ec8cc2238c707079
font_01_sfnt_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 18872 bytes
SHA-256: 1fa06578e408ae235f55277584e387de88900d10fa1e39ab07a9075dbbe8db5e
font_02_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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