Malicious PDF — malware analysis report

Static analysis result for SHA-256 356591e39bd60f7f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 06:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9a8a4e961910dea8e0a5f1e85a36af9 SHA-1: 3e0b204988b14e5e62d397c975198e93db91e005 SHA-256: 356591e39bd60f7f4b353e6d35dc988bec0890fe6c9543d22ec780e6e6e09875
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://renesens21.com/ressources/upload/files/77954597399.pdf In PDF document text
    • https://gdaniec.com/upload/files/69994803747.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/20707383335.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/92572895994.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/99493172961.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/33202557795.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109091748395972.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/pewuravov.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/56938872043.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/bifelofezuwabaxufevexuves.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/29344128269.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/pereraladidopefezapazurim.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/2548442490.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kinaban.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210902183231.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/27045681887.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/56257109780.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/37472671334.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/11072149859.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zuxorim.pdfIn PDF document text
    • http://boki.hu/editor_up/59346148372.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/galugiw.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/25205710895.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/56869642976.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/51604611723.pdfIn PDF document text
    • https://nls.vn/upload/files/88065534989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+set+browser+as+default+on+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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 15748 bytes
SHA-256: 62f4b41b26a1e8745648f9c963a08f9a1d3a5c07f3fc31b95afa693c099f7385
font_02_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10664 bytes
SHA-256: 3a50585d027a7c655cdd980fd2c34ae6c392e43a98d989b806147415a8eeb72f