Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aa347ba91bf9d0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 04:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d62cf52ad8a5163d1909ca7faac1703 SHA-1: 057c82f08ee6d2faee70b1135ac0495c2ab16193 SHA-256: a8aa347ba91bf9d075455625a60660d699d55e9384fb96b5804fe1b93db9f81d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://drafthe.ru/uplcv?utm_term=types+of+stay+wire PDF link annotation
    • http://danguykhoidoanhnghiephp.vn/Upload/files/jafiwegulosex.pdfIn PDF document text
    • https://izr.fr/files/rorevibuxanaxem.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/gifesuduselamozijazix.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/99936106799.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/jikip.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/44186793799.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/67021346387.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/55005194624.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/bamivobekilivupufatabofo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea797cc010---8128779651.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/bemofamipexovido.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/neludilowonuparuvofaz.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/25628267141.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/23363897311.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/tibip.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/sexawotewifotafilutagaxi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/e7u29ijdr3ooad0k08v4hbvtki/43257398780.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/nogebamirulivetukaj.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051709353573499.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021082103135573.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/wewazutiposatawosabe.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 17980 bytes
SHA-256: f156cc19cee0c27b9a738ebbd4bb07690cf91b8efe59ae567f58d67d6fd222b8
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10364 bytes
SHA-256: 5cc83c050f6f5555b0de67a8f7eea80e05620815755323c3e83502138deb8587

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