Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a39da0bee9e8890…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 16:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca45b1cc6e0fc13a4fb6110000fc7d34 SHA-1: 853c038feeb2537c5db6494518730d2191981401 SHA-256: 0a39da0bee9e8890b7bef0add1993b7691d43f53a14c41fabe63f22594ca93ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a probable attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=project+free+tv+2021 PDF link annotation
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/67317415664.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/14945395096.pdfIn PDF document text
    • https://bak.vn/upload/files/53299305394.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ce890a1f---75365809563.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109131630001716.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/libonikaxo.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/nokidopoxivelotafanibub.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/remerajesizoxexuw.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/23848325061.pdfIn PDF document text
    • http://coolscape.info/images/files/rawokutedur.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/18181631439.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/wapaxi.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109131032554480.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090416004775.pdfIn PDF document text
    • http://egitara.com/upfiles/files/fanunefit.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cbf1f7bfeac833001bb5ec2776abf822/levuwusufefomarovik.pdfIn PDF document text
    • http://tdbm.vn/upload/files/77448817284.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/99965660807.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/49070223125.pdfIn PDF document text
    • http://woykoff.hu/upload/file/sisexuwijojuzomuniwi.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/bonuw.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/dejepimixamudiripopefut.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/23630652319.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/16082657352.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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 17988 bytes
SHA-256: 377ef0bf6e4d4a3f3980264c05686ab5ab15be7be163c4f0363bf094fdf66db9
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 10248 bytes
SHA-256: e1bca5896069522e14ae003797c5186c13bbfdda9afa77b569b1e65e0512e24c

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