Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdf238316b893bb…

MALICIOUS

PDF

72.6 KB Created: 2021-09-30 22:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7610e30d9f1856716402240aded0fb49 SHA-1: 4660f828aa979a2ff2d237ee6daa8ef5634eb502 SHA-256: ebdf238316b893bb1623618ad9252e781fce3d6b8aacfdeebb4459cf6682d0eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tssch.in/tssch/application/admin/uploads/file/lemafufapikiv.pdf In PDF document text
    • http://papienbanana.com/user_file/file/12122119315.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/romokatutu.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/4274904554.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149844caef4f---52940043156.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/10811759080.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/89461202803.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/51036500897.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/99876802112.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/62077692507.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/5889878509.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/66705133056.pdfIn PDF document text
    • http://esistore.be/userfiles/file/betogotupe.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914182450901685.pdfIn PDF document text
    • https://dukupahit.com/contents/files/diwelivelosuluxa.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/muzijebejoxef.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tupebupimovakube.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/82931344637.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/sipod.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/kerujibenobamez.pdfIn PDF document text
    • http://abc-tel.ru/data/File/lajemerar.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/nulanexe.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/67149624408.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/jevamigobodafupigese.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/kasuvapibaxazunoniwu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/vukenu.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/89117617601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=methane+and+oxygen+reaction+equationPDF 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_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 17124 bytes
SHA-256: 1be816aa00327e86ccebd991d3f2ba8d4f620a164a992358b575e660d272cc07
font_02_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10892 bytes
SHA-256: ccc0374eb19ec4b62f65e51978cd4a5824f2c7fdb3cada3426022c377ea6840a