Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffebf57cf3deea84…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 23:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c20bd733a6f798d55a3c50aab7d5101 SHA-1: 35597d7a9af9710043ccc5ee433ec8dac44cb6d6 SHA-256: ffebf57cf3deea847e5ffab5389acc918c79c3f187e23185e97067186a2ee923
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to redirect users to malicious sites, potentially for phishing or further malware delivery. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=jogos+rpg+multiplayer+android PDF link annotation
    • https://tortugafilms.ca/adminfiles/file/46166637935.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/61252491784.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/dubarexuna.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/fepivuwojexo.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/83608438240.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/69438955292.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/72882194446.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/37821728462.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe4c18123---65288437641.pdfIn PDF document text
    • http://infunplastic.com/d/files/6909309718.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/xodadakalixobaposagorira.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepozipawox.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/vivetuwoduvuwomama.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/57692605567.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/74933449016.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/diwakujejadifakurizoporix.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/newimegesefidusotorokej.pdfIn PDF document text
    • http://gespk.com/userfiles/file/74544422445.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/65it9ju6dvarbks75feqkrdl71/99312907766.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/babanupitiguzomu.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/sawejikiduwux.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/88279650227.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_off0000ba88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 17368 bytes
SHA-256: 928c6abaa7012ef157db27a9c8f70bdf1856be2865e8ed8512b777504378ca42
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10940 bytes
SHA-256: 0e1b917de19dff6173788129125781919874ce8aa12d41d80644ed160672406a

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