Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82f53ab5cb9aad9…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 18:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8bc208e28b72c3200def32d829b5a94 SHA-1: 0c5be65959900c72a7ec594c21eb37bd0c70d5ea SHA-256: e82f53ab5cb9aad9628439abca584415191bd15653d5f8412c55713d8533d829
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://noursportevents.com/wheelmarine/userfiles/file/fexunariw.pdf In PDF document text
    • http://licausi.it/userfiles/files/lexux.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3430546c3---45945397481.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/zuxejonuzazadovasebij.pdfIn PDF document text
    • http://drironcat.com/images/file/sufuvafaninexeli.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/fafuwibutawebil.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/73444178907.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/surumi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/3004227103.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/lovokuwefifefe.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/kegaxezebesoravopiwoles.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/muvopevijoziroxeturegijad.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/xasotipabetoseruziriso.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/40867492669.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/lagepududiwa.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/faniwumabuba.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/68658797676.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/kegesesawakuxupofulanirap.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/36444532007.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/retow.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/28537730919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dream+house+watch+onlinePDF 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_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 17008 bytes
SHA-256: b6c1d01b93d8afcf5abdf57da97a7aa02f0167753f419583f77602a527dba8c2
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 10680 bytes
SHA-256: e620d58c176dfa723e8a9c5f91311c23e29745240b5a9cf3d6d419999d178b55

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