Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10f4516055e1344…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 01:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cd8bd959013df412e743c8a6679832c SHA-1: 3679f600977813d1b286489ee8e5d568ce017611 SHA-256: e10f4516055e134496e09b30d2e96f5ba89b2c9cf7ae4fc66bc01e480f391a8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to host phishing pages or distribute malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=expertoption+apk+download PDF link annotation
    • http://jfac.kr/ckfinder/userfiles/files/kitelaj.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/2579521730.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/79122035018.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/vufusoduxakimox.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tosar.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/6507373439.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/21926639207.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/befudatubuwerekasalo.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109020747508412.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cn8mtgreis48ldep6qnknv0i4i/31728491655.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xoxirat.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lenikojazawatoniboponula.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/35868259839.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/lamafu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/87591046458.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/77301838371.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/worivatakugowikogozu.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/612f5badb2aed.pdfIn PDF document text
    • http://capableapp.com/uploads/files/85298174096.pdfIn PDF document text
    • http://amdind.com/userfiles/file/rumuzixizemes.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/36297404162.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/dukofaja.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/vedulasupe.pdfIn PDF document text
    • http://grimastone.ru/files/tidedizevagexofekaduwi.pdfIn PDF document text
    • https://vzglavniki.net/data/file/sarutojanibaba.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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 10480 bytes
SHA-256: 74d5a26e549e95f509694af10102d89b403aa915598309e269bc1e4cc31867c6
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 18116 bytes
SHA-256: 22b45c13807f01eb88ee5cd8e1ebfd6d6319eb4db74102b153f3b3ab51aac2e1

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