Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6df816d6eb4960d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 06:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2c122334f55f64e7b3745a393c6021b SHA-1: fb8252496a1ee414e681653baf6af04d3747e74e SHA-256: d6df816d6eb4960dc7862a4372b945ab2dc8a598f21f80a5c2a5902b54c532e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://lepetitjaunais.com/userfiles/file/56709528952.pdf In PDF document text
    • https://dbmotorbrokers.com/userfiles/file/bobutirim.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/58905205353.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tbsgsg0ird3lb0t865qk6us1go/84352018120.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/59026401717.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f6e1aa017a4c1d4b60821d8019c24da9/fitozikojatogeguvosizika.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/bajiwivolonige.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/37507997377.pdfIn PDF document text
    • http://falconltd.pl/cache/file/rifulokewem.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/63939019634.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/75161019047.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/88478604035.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/sefemukusilaxekobi.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zarolofajupugix.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/91165146594.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/67822388529.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/dapurivawizum.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/38771274980.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/95243017745.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gukevimogarovezap.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/12274106442.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/sizogixugiwupatela.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/39012781684.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/xobigusonilateruzubu.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/60254125497.pdfIn PDF document text
    • http://elskenecologie.nl/files/81896027980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=video+calling+apk+modPDF 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_off0000bd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 19352 bytes
SHA-256: bfa00d6ad3326afa36e855a391f0901924cbe2ee87db5c58aabdb417caf8a65e
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10552 bytes
SHA-256: acb269983716c8498a1d2e31924db20e5e041404c74f729a1ce2f39da04765e9
font_02_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1