Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ad58e456ced259…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 11:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3a6bf91244afd5164588e2e1871893e2 SHA-1: 929216bbd2194dd0313789a43a61f9eb00997f64 SHA-256: f2ad58e456ced25910c766fa259a5836bb836ee26324e7d417a9066a9b1fb02e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to manipulate search engine results or redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://alternativecarrepair.com/userfiles/file/nugamemapulilemeje.pdf In PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/9262282795.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///tuxuju.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/69233834999.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/vabuj.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/11331151786.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/fiwifeladipebe.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/54492570774.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/ralelorixikikotibomireto.pdfIn PDF document text
    • https://bachson.net/upload/file/36420521280.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/44844875693.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sofuwuxaj.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/96663626226.pdfIn PDF document text
    • http://rnralpha.cz/res/file/buxito.pdfIn PDF document text
    • http://tion.hu/upload/file/63767067864.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/2937686829.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/18554712714.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/92384271932.pdfIn PDF document text
    • https://webaprint.be/img/file/disusaruko.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sfe9t3ejh99upc9dobj8cb32i6/seborixiwasituvavob.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/lonazijilumuzif.pdfIn PDF document text
    • http://paradoxine.com/upload/files/54738522966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solutions+pre+intermediate+student%27s+book+answers+2nd+editionPDF 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_off0000b635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 18568 bytes
SHA-256: 1f1965461fbf1fc439ba5dc9ab5b98b9e25f22a0d101765a0be9f35d890504a9
font_01_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 11200 bytes
SHA-256: 390f0fbbca3f4400b641768dc5cd7a294decab7b10dc800bc2c439236f9b7907

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