Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cd6e20c6f4c1ce…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 19:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d7e9f288dac2b9c9bf2d50f6e398ae7f SHA-1: 5caaa6aeafe1e0c934d85fc7265c0ef21696fafa SHA-256: 49cd6e20c6f4c1ce9f26aabbf676c90e96201fb0089aac85e89e2d9bcda1d027
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=friv+among+us+free PDF link annotation
    • http://metallpress.info/files/xixusidogivugojawefamimo.pdfIn PDF document text
    • http://shahgrp.com/uploads/44123251668.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/24312109737.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/genenorobifakakekeridaw.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/64564225276.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/73014974028.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/tiparibuda.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/92607138524.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/60286882538.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jixuze.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/53633460677.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/34257591182.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/92286639566.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/68581796500.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091116235280554.pdfIn PDF document text
    • http://tavio.su/files/file/58267024339.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/mogimitamiroda.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/gevekonoxezejizuzu.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/pefekufoxotipixo.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/5337197056.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/noravapog.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/57404996108.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 17296 bytes
SHA-256: 8020c99e9c4ca83b5d534ffcc8c9a7224b84c1882caec670cae4d99ef55b66ed
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 10556 bytes
SHA-256: c8e81097202edf4e18393442f177a262ceb0e1c7c17de6df4dd28ed39eb3ac4c

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