Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d1dda1ba813347…

MALICIOUS

PDF

72.1 KB Created: 2021-10-06 14:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2db7d630bc0fdd975628b26a3879e008 SHA-1: fde7978527f4611508a86fcd23ca0b7299c53ea2 SHA-256: 93d1dda1ba8133473bf0f4a66e4072c1cc68b25af9fbc26169fc7ef7d59468c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=the+white+queen+123movies PDF link annotation
    • http://zit-tech.com/userfiles/files/nogad.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/muneris.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gufezefavopipapajigat.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20211001105306.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/sofutenije.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/wuvovurojukaliferowub.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/62012965741.pdfIn PDF document text
    • http://receptlap.hu/files/tivexoludug.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kuxosex.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab829c951e---welofudokazosadubuven.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/27481624649.pdfIn PDF document text
    • http://abc-tel.ru/data/File/puwepifi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/surasupigemopege.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/roragarubetu.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/gojefo.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109280050481410.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/83485692510.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/11515931438.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18477996638.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/mobobadub.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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 16904 bytes
SHA-256: 85ba2588f1b2b127f66768401ff4c813aa8a4e7b757c8e27930bde4700dc0730
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 10772 bytes
SHA-256: 86999735065915ef57c6c4c407a157fc6023540e7f300adeba1122169a980409

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