Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c5edeb4c12b289…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 14:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50c3d84f596bc821b789fe839de5c31a SHA-1: 4b7c98da4bab86f5a83e4cd8b1b7d9fbef967889 SHA-256: f9c5edeb4c12b289a5f024468f6b289ed7aa313f0eef087977e17e57aa814b9f
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 heuristic firings and numerous external URIs suggest the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=whatsapp+apk+file+download+old+version PDF link annotation
    • http://saipanbooking.com/FileData/ckfinder/files/20210919_04DEFBEE2D40C637.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/13698343458.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kadewakozevefirojolefuna.pdfIn PDF document text
    • http://kotolantopeni.cz/file/sejemibixo.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/sazuvaxazo.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/9200586159.pdfIn PDF document text
    • http://cloverdiamond.com/file/xesojebu.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/67924105336.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/55147119803.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/51179578503.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/87830165393.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/89432792620.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/zabetafewumopabi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/68900326633.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/pupipopesenisudise.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/95440336483.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/girasapimewufop.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161410db30fe79---44991504496.pdfIn PDF document text
    • https://people11people.com/uploads/File/pewitakabof.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/87440734350.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/gonatuvevejafidixu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac446b9f4---pukemavivugezezazenuzop.pdfIn PDF document text
    • 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 17948 bytes
SHA-256: 7546a56bffb78c4efb213886d4cd0aa8ccab0147d687962cc3df890a22cf7e07
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 10832 bytes
SHA-256: ff18c57b9fc7491c2df3568ce07d49b1d75d88c6e31fb2851033f47a0c59f30c

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