Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b8050c00e73f26…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 03:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a1417e01f4a28f68befefedb3828e47 SHA-1: 0e13a0e48ec8d57a888a691fc447a670b0565fcd SHA-256: f3b8050c00e73f26f7388d1d869fcf7b0b762b74f4f24382453650f2f1c33bc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to potentially malicious PDF files, suggesting a link farm designed to distribute malware or facilitate phishing. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.leasing.net.in/ckfinder/userfiles/files/88788917006.pdf In PDF document text
    • http://uptownchantilly.com/uploads/files/26006779827.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210911234858704.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/fipobowikadizupumoxikal.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/32566262953.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/favoworitetijazogopov.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/mizixeradafuginof.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jidezuroluk.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/jufawabivawuvivanir.pdfIn PDF document text
    • http://pi-consulting.ch/download/56087155103.pdfIn PDF document text
    • https://shibbirs.com/media/files/60947565000.pdfIn PDF document text
    • http://veitali.com/upload/files/53003460036.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/59153344203.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/8238824381.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/83616964041.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/pimemobufatigajira.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/sobutubotegim.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/nipofosowagonenokutolimu.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/tajodezigivikatijikexun.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327f7763969---11486061988.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/zulewu.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210910173038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+emulator+install_failed_insufficient_storagePDF 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_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 17204 bytes
SHA-256: e1c7db5797b7211fe1fe944a2ba9b28db04daa58e30ecfc68ce687ec7a6696e6
font_02_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 10932 bytes
SHA-256: d6b535c72f289f880aed6e5fa13a1a831373f167d50961ef77bcb6875d20d4cf

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