Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6950e72a1a4c36…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 08:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c898b080e915714291168e3579ca15f SHA-1: 2ec418fcc43461336b02535894f5a53dcc26d952 SHA-256: bc6950e72a1a4c36dff2d0fefe01c870c6d1cc8896305f8524a0555341d78c4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on potentially disposable hosting, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to drive traffic to external sites, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://webmedcentralplus.com/userfiles/file/pasineduxurofiwejeburo.pdf In PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210907062529.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/92412347059.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gurizabakik.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/81673294844.pdfIn PDF document text
    • http://freeski.hu/freeski/file/34093772579.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/23714085882.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/35970836759.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gakosuwiginiv.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/debikalurudorijubo.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kilapufila.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/bezowebukuxadeg.pdfIn PDF document text
    • http://worldtrip-eng.total-flame.com/application/views/blog/userfiles/file/petuvufavulewukuruzo.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/lafikotolaw.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/pobekilujigufus.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/36082010037.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/busukokokasudesokib.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/dafakasaluwutosisa.pdfIn PDF document text
    • http://idroter.org/userfiles/files/fetudekebinoluji.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/21129491826.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/xometomopomevut.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/85535662220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stupid+game+show+answersPDF 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_off0000ae08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE08 16448 bytes
SHA-256: 725fd727c809e52aca1e0099636342441abef6dd3223e2f252ea719960e3ed25
font_01_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 11056 bytes
SHA-256: 57ed66bd282b483946ba2179a997f2120b5807c9c426ecd7469df59cb6b7d52a

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