Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8f996d9225d5be…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7023126bdb2054335663bfabb017624d SHA-1: 8456de5b82cbc7db8093e635fc4e30f4903d77e4 SHA-256: fb8f996d9225d5be76acfc1805e1ab603d140b0403b028865c0a04115465018f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The authoring application 'wkhtmltopdf' and the presence of PDF-specific heuristics further support its nature as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=sonic+racing+android PDF link annotation
    • http://videotour24.com/data/fckupload/file/nutuvidira.pdfIn PDF document text
    • http://crediramasrl.it/public/file/97821762745.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/godonowaruk.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/2768401301.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109050451296397.pdfIn PDF document text
    • https://yodobashi-church.com/zaradazazisi.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6144b8ecd21ef.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/77371406627.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99814846209.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/97253583501.pdfIn PDF document text
    • https://zzwgjx.com/d/files/nurezuxiregugamuralikowa.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/jerajigagujijasodu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/257d8de1c51a85224ed98b08fb3309cd/sexadapubedagazi.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-12/20210912084856274418.pdfIn PDF document text
    • http://www.buildonhope.org/file/22110135275.pdfIn PDF document text
    • http://parentini.it/userfiles/files/sekomugamuwituzosowi.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/55942336693.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/47380097520.pdfIn PDF document text
    • http://someteme.com/archivos/_20210904033043.pdfIn PDF document text
    • https://binhvi.com/upload/files/76470422570.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD6 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000b7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 16948 bytes
SHA-256: d80dd0cc84c1b597b2ba2edc6dbc9c9ad88acf608bbd32ac1ff7b5913629a95f
font_03_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10176 bytes
SHA-256: 2764e0d2ebce2ce195c8ece6be008fe547933f7288e6b576080109ad835e7cd6

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