Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e4d5f5649552d4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 09:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3979582534e9fdb9d9b99d197c0b0993 SHA-1: f25ba3e5797a84bb578658f28f5848cdf2b6715e SHA-256: 29e4d5f5649552d491a68c9b74f1aee397c6b3254dcad5133caf3adacc184fb6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brincandoeaprendendo.com/fotosempresa/files/tumuragudugebosegupisezu.pdf In PDF document text
    • http://excitechem.com/userfiles/file/gutexapakezawojutalifad.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/99739308023.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dugimagubazaxijari.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/vubupadikukunogi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/dufowoximazo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd21d06af---53544322107.pdfIn PDF document text
    • https://blokhol.com/upload/files/35966474570.pdfIn PDF document text
    • https://priscar.com/documents/files/6911736583.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/19412073407.pdfIn PDF document text
    • https://msiutilities.net/documents/giworidisizanomiduzisag.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/51200256812.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/suwizujawavoganobokol.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/wamusabepani.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/53178772612.pdfIn PDF document text
    • http://markone-tools.com/upload/files/lumeji.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/xesuvivozejikudaxaxola.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/26535662839.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/6617789427.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908140028.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/37933416392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=as+the+deer+violin+sheet+music+pdfPDF 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_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 17044 bytes
SHA-256: d227fa3422efac14e8f9b18834dc9724b952220079dec3c74330bc3ed42dd809
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 10868 bytes
SHA-256: d7ab1c57c6834557de3114dd51cbe4a82f8b6ef98a5eb41c15312fde274a58b8

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