Malicious PDF — malware analysis report

Static analysis result for SHA-256 8086333f6415fa60…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 21:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d8aef756c87f459915eb6e3457759d4e SHA-1: d612d9769045a50838012453b0ffc131cb8d6fcc SHA-256: 8086333f6415fa60f6a67b79693a005d4f0d350a51a496f483ca2f4b0f666919
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to potentially disposable domains, indicative of a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or deceptive content, potentially as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://projetounificado.com/uploads/files/lumigaxomemizik.pdf In PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/85824010046.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/51012717644.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/61224334925.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/42580564208.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/ranotisofu.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68377557437.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/lolan.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/legogeduledebejemozipalej.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e165e5fdad046ead2a337f554d5832b8/13762198953.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/92524603817.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/nafelapap.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/59631731986.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f626cb2c7---11314330686.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/4378297828.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908060605800464.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/vaxag.pdfIn PDF document text
    • https://jin-ji.com/upload/files/pelaxotexojoveli.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/70000691112.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/22383817320.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/mexepewivisapulevab.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/65965820061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=security+apps+for+android+downloadPDF 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_off0000b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 10988 bytes
SHA-256: f261e0efd2e076442d047dfedc1f8341b1999ab977b9dce637840e06d0337b63
font_01_sfnt_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 16688 bytes
SHA-256: 8f7aad0557f68243cb70694e63c16b270f0199e7c0c5ee3390098cbe8c7193bd

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