Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8ffc2b41d74859…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 16:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14f3923b4895e4bc7eda7a784231913c SHA-1: ada50a448bd90ee15509419807695031d45233cf SHA-256: de8ffc2b41d7485929b97916d05cad769a200ac60ed12bfcf477fc4f0db114fa
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=best+private+dns+for+android PDF link annotation
    • http://haithuanphat.com/uploads/files/zinilepu.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/fajabegugoji.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/40489421398.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/duturires.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/72692356004.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ert3p7e7brru29k0h2scnicih3/68868712305.pdfIn PDF document text
    • https://12shio4.com/contents/files/19263582498.pdfIn PDF document text
    • http://effektfilm.de/files/file/80247318890.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/sisajokirugoxelufe.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/56766844944.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/13123115339.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/191810_mibajokipixekobef.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/42113601533.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/miwikijof.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/89042770213.pdfIn PDF document text
    • https://gameclub.by/uploads/files/guwotebopuxavalipezudav.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/57189372117.pdfIn PDF document text
    • https://finliz.lt/i/File/10584415499.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/98296458963.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/wodarujukusabukipe.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/boxanusawunokowufed.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/37367988948.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/monizezolukepudibetevet.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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 16068 bytes
SHA-256: f23aa63fd195726556b41a3bcc14a68643a092391906477932528e4623e35b45
font_01_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10564 bytes
SHA-256: c36b131f78b820d1df8dada0f376818f07dd4d0d57111a32b83d6c3a968cfb76
font_02_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.