Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c715c4bd318cf56…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 08:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3ed3a02e1836ac935bb5cf100048b20b SHA-1: a3f70ee43735223fa5914b9d173ed7264d0649c5 SHA-256: 2c715c4bd318cf56d7ec59b52ad4212185cffcdf137134004da81eb63135db62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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=download+gdmss+apk PDF link annotation
    • https://thai-airpark.com/ckfinder/userfiles/files/31422959261.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2db10c55---43192863993.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/13787262706.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/26744796289.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cafe89bdd---11545011118.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/19450710140.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/49983358871.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/bajomowumutijubavukazelom.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/popibojevewo.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/lotozujokipufifo.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xelusilufalokefulivebo.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/novosolunobuzogiforo.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koraf.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/64323840321.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3991734525.pdfIn PDF document text
    • http://itena.si/uporabnik/file/69165532306.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/fujuj.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_396F2EDB6A10DE39.pdfIn PDF document text
    • http://demkapi.com/resimler/files/wosurebenugi.pdfIn PDF document text
    • https://hirurgija.me/files/46975623154.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/nozosegiwabifizosod.pdfIn PDF document text
    • http://104408017.linker.tw/files/voputimebimobe.pdfIn PDF document text
    • https://bataretak.com/img/files/file/61465751988.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/wured.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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 18264 bytes
SHA-256: 53552f339ee03dbd662f68da253a402b8bcd0571f54280453d7b12c4cb541bc7
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10492 bytes
SHA-256: e635cfac77e779cd78cdaa3d25806b68f7faab6020b7223ace93a5488a28b78d

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