Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f024783a096223f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 10:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c8b268782bedfdc85f3ff04764efb98 SHA-1: fd40e91e9c9198e550ae22fb988a76324d41940c SHA-256: 8f024783a096223f2eb7aca1c1bfb003d96b40405f8100b76b41b9bd84563c61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://swagath.co/new/ckfinder/userfiles/files/91917291405.pdf In PDF document text
    • http://uralteplostroy.ru/content/file/gatimufixipokus.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371122789a2---misukubasusonefek.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/67962817861.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/dajegolotivapo.pdfIn PDF document text
    • https://bdata.vn/upload/files/34782235739.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/guxolesewosedef.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdfIn PDF document text
    • http://jljemc.com/upload/files/88068759544.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f8463203c02396c2a7350a4727df89fa/6813106225.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109031426192440.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/18002861382.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/5850079075.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/27609000415.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pusuzogajenugaxofofugura.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109030705256312.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kejukiruduxirebinebabefiw.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/xalizupod.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/94597555835.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/41142373304.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/pimojugexuneve.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/konixitototajibinoduvig.pdfIn PDF document text
    • https://frisch.ro/files/file/sakugofiwazuki.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202196238261677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mars+attack+movie+downloadPDF 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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10768 bytes
SHA-256: 1826ff0cbd237a4b723710ada4b9f6c213cd20dae6cffedd421a48abead2cfaf
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 17800 bytes
SHA-256: d75568033402e676309d31ceacefd16141754ee27ad7729717e88ad2f5af6509
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1