Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccd92aadb048705…

MALICIOUS

PDF

89.3 KB Created: 2021-09-23 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad85b4748b00c98042c65dacb6e11a0c SHA-1: 9ab4d6e1bc0026985fe1838d971f4e230f86c2a4 SHA-256: 1ccd92aadb048705983b7acef87514f599ca61e8cd0c1d23ecb43af00dccb07b
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF acts as a link farm on untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=the+lucky+one+online PDF link annotation
    • http://icmasistemas.com/userfiles/files/41044305416.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/jefakanaxabisojugom.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/48688872754.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142dafed8e0e---kewez.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gisixepavigivewegevanoxej.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/kifalukerobejopidagofire.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/tamadivisuxixupol.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455559149fd---39453752951.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/fafiguwaku.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/97979215848.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/fuzivadigefivubiga.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/71493364828.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210916234603.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/juburirok.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/29965215518.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/getevevapuxuzapumug.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jisidumimevanonupe.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xixira.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/pugotiloperuw.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/72668250471.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/sebikatoli.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/57127688737.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/vusudapagiruzemokofudoxoj.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xizujezaxemenog.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/94077566719.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_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 18108 bytes
SHA-256: a0ebf1ea989ffa9509cee431ab3e356ddfd1aa8893bc9f86a98eda18f6b2edd6
font_01_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001411e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 10068 bytes
SHA-256: ecee958ddeb52c2ac83511bb4bbf93a5d51f6619441d8c4762d9a3e768ad9810

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