Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbe7eb22acb9fb5…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dd0257fb1f9317b02097ac23d4534417 SHA-1: f6fa57785c5133a4857838e4b2c7d0481d366676 SHA-256: 1cbe7eb22acb9fb50b7ad40eaaaed17c16e667a6797b7aec212583219f2f36b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.karelo.com/uploads/File/53624423521.pdf In PDF document text
    • http://aktien-analyse.de/images/File/mumuxugipoditogebalafazu.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/15569044515.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mogevulumogogutozum.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/46184093767.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/ralazo.pdfIn PDF document text
    • http://namngonviet.com/user-/files/fivozujomeluvonusin.pdfIn PDF document text
    • https://profesa.net/userFilesfile/46650585120.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5951aad09a0dc0669265bc803333d76/58550551165.pdfIn PDF document text
    • http://laserinnsbruck.com/static/lewejonawumorono.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/94660893552.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/71068613742.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/joruvisusosa.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/89235349514.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/xasujewifetigalabinidepi.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/jijanikafuvemisotib.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/nasinotuzejeviladubolo.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/nadebelo.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/29923660684.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jejuwogomotibejatawugujo.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/58083283555.pdfIn PDF document text
    • https://okazionche.com/files/sejesefegixutamukodo.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/12340391172.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/925869748614e42bab7bd8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=galaxy+a21s+wallpaper+hdPDF 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_off0000b219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB219 15372 bytes
SHA-256: 5a6e3f1e10ab0aa39465b6af5e2a3256e5899d108263039eeb95a158f28c6082
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10588 bytes
SHA-256: 0a6092345453019bd3d3b7afda4acda38e7aba58c4c3728ad1025cdad45f295b

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