Malicious PDF — malware analysis report

Static analysis result for SHA-256 99298b155661043f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 08:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 066bedd31d0269a1f4172f2e5825633c SHA-1: 3cb9aec837a301d43943e72cc6bc95640a536fec SHA-256: 99298b155661043fbf58181382c5246044f48e70605563c94f9e90e8825d04ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external PDF files hosted on potentially compromised websites. The presence of numerous distinct hosts and links suggests a phishing or credential harvesting campaign, likely delivered as a spearphishing attachment.

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 http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2b46f44f---tizunuvoxarus.pdf In PDF document text
    • http://hamzalegalservices.com/userfiles/file/85346452402.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/92346179639.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/soniravar.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/wulunibuwigunepogasopi.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/mudijafemezuranedin.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/gatukox.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/zixuzigonifafajo.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/62184707240.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/89150054273.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/foxutiseraxixe.pdfIn PDF document text
    • https://suksesunited.com/contents/files/60240328110.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xonidisolazu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/kijar.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/nefudujeb.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/80848372726.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/92833064399.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210902_FC893FA11ABDEA44.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/pozupuvawewir.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/peliniwijesemos.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/fuvineperigogab.pdfIn PDF document text
    • http://drironcat.com/images/file/karenad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=s21+ultra+have+sd+card+slotPDF 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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 18644 bytes
SHA-256: fdfa5556e3bcb23e81417f4deedf2c3da1f473982211c9083ec210937dc88aa0
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10684 bytes
SHA-256: ae730f65d1793fe54243d7f9d4f9fa0c68548be0ae6f806a3a0ffbcd8d5645d6
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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