Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bf100803465f9a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 17:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbd5848ffcde5438705ea97575ffd35c SHA-1: 9e39dc913cc8da3d382154670cfcdac6f205f838 SHA-256: 92bf100803465f9ac34db001d306b2ba2f82db254b2d1e6a9f33782822923fe0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiotecnicobergamaschi.it/userfiles/files/90625025334.pdf In PDF document text
    • https://mayphoviet.com/media/ftp/file/jaguzelokuletatavepakaru.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/marikupon.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/bafefeded.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/38840164848.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/9005389921.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/69898266186.pdfIn PDF document text
    • http://altinay-law.com/images/file/84260186517.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/53547529781.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/21066228436.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/jufajonufasowilasezexotan.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161314ee06b848---dezuwu.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/moximit.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/46557783343.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/503173027.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/wolubigurujoxukojesasado.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/kofokinesepagomimaxorun.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/rumitomaler.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/44228138346.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/zinemik.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/nekivek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=new+releases+torrent+magnetPDF 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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 10424 bytes
SHA-256: 0f82950410dd3f1731579ccc7eba81096e839e88cb1e1f3c8ad89f1c12ce6961
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 15360 bytes
SHA-256: 2d25b1f332a26cb4596f67ba4bcb7eaa26cb3ce680e99f5cd7c68f66baa68573

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