Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fc74fcdc86a4f4…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 11:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19ce4daf22617a5f1b72631fa0939846 SHA-1: 50f9379ad28ebd24aca134a2a23bf69b0811c0b4 SHA-256: 67fc74fcdc86a4f48e12008043030858e86c1f5b925de9513b305160988bf7b6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external links suggests an attempt to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • 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 http://99hospitalitygroup.com/ckfinder/userfiles/files/10303066472.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9719251b5---gotixitonivaxejeximizu.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/4282017112.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/48400160838.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/61331681838.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/bevikotepis.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/menubesinadi.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/2025949724.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/97760577140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+app+to+edit+excel+filesPDF 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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 16936 bytes
SHA-256: f7b33437b92630756ce60213794c66ac6eb0539430edc8e27c5ad426d103e70c
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 10696 bytes
SHA-256: 4d548ba473ba26153f890cec2bc5fa234d0b7d85b7641efffd019ca392866d58