Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b54eb86bcbf84d9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 20:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4aae9c60cd38b3d631dfa45989dbd5f2 SHA-1: 193c203343e6ba445e58809f9fc3b422b613433f SHA-256: 6b54eb86bcbf84d930ea7f477c900c475e90fa8a04ffe091937e7656da7ecb90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of a link farm on disposable hosting, with numerous links pointing to PDF files, suggests a phishing or malware distribution attempt. The embedded URLs and the PDF structure are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ottotech.center/userfiles/file/57226102113.pdf In PDF document text
    • http://bulgankhangai.mn/userfiles/files/masixa.pdfIn PDF document text
    • https://chineseclothingonline.com/File/goduzelopovijesaxinu.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3ildalo8osf8jcs7nnii1s881s/56650561755.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/88155828841.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tojinewefapelimogexanejak.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/96893815606.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/11452002890.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/17817538271.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/73886135566.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/xugovitimorodu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/xomalarinesele.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bakaseza.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/58337028946.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fofifinebanuvisewilon.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/wunimoderesapotodiji.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/16746634271.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/berepubigudoxetumobelalar.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090900473448.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210902_8B614B5CA34AC895.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/tuluzateje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=house+party+game+free+download+for+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_off0000afd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 15552 bytes
SHA-256: 8e09f224e16878dca5cb865870329da3b413e217f63c30c660abf7a00803de61
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 11132 bytes
SHA-256: 12c97c7cba35890c7717c8f0c5a8a5fdf6fb0907f8197d3d3f49dc4caf0baac0

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