Malicious PDF — malware analysis report

Static analysis result for SHA-256 38040429ef739741…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 02:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 78bab43cf856e8b70ad3001291ac536c SHA-1: 34f62a893e3b036240ddffe734819e6a7754dad0 SHA-256: 38040429ef73974114cd5395f142ff2b746577b378aae9e2408871d94e5656e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are used for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://studiochiodo.eu/userfiles/files/katalabogojut.pdf In PDF document text
    • http://rotarybrescello.it/userfiles/files/xuxarimafigepexidapesopu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/tdtso60791k22mndhid2fnce4v/mofojatenoxu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/13918392792.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/67984827645.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/datojelutovikijuxafu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/4952675233.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/rizefabazupifun.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/80459582621.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/kebixedalavuxij.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911170156728.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/revanureti.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pumorafizumumevenepa.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wevekuvilupoxapamivalaw.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109060650253430.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/19339559637.pdfIn PDF document text
    • http://dhf-china.com/d/files/kixirabebusewira.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/71404959565.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/pawiza.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bataxazusinirefuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mod+apk+forsaken+worldPDF 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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 10472 bytes
SHA-256: 26499424fe896b9437992e87ca492808a57bdeaa2b988f2704dea6274b9e91ac
font_01_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 18876 bytes
SHA-256: 23cfc6cd3f530de25195d78a8110b9923acd19ba52e228c9cfd95f7d80a38be3
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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