Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f42656e3e0e98e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 14:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ecafa8a3bb777228f5ca196a599f8691 SHA-1: dbaf65b3c746b4c7ae1f5f403245fe094d1a7e37 SHA-256: c7f42656e3e0e98eb15d811e3dca17cf6de399c3206baf309804c4f92cc8d974
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://247christianity.org/fckeditor/userfiles/file/380903543291632465323.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/96883245818.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/suxitogovakizosafewelot.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/75404322302.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/58742222196.pdfIn PDF document text
    • https://coevent.ru/upload/files/bikuzone.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/4106756807.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/94844566859.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/34145807242.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/75562866948.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kejufowogu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305cd7857e4---gutifelu.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021919238574586.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109060806149007.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/79383793482.pdfIn PDF document text
    • http://strahyi.ru/images/file/pijizojipiwuxiv.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/33480580884.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132925e82875---kejerimogukuvaxarapero.pdfIn PDF document text
    • http://adice-area.com/pictures/files/80559098468.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/85169759876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=surface+pro+4+vs+macbook+proPDF 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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 17500 bytes
SHA-256: 6734eb890ad11d7f93a363c6ba6a3e6c2b5c8610b27d53da4592def6d743dc31
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 10852 bytes
SHA-256: 11496590ebe640d26da6d98998bb15e5248e2b0808c8a8b649b44685d3e7ace7
font_02_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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