Malicious PDF — malware analysis report

Static analysis result for SHA-256 78909a2e5ba0f096…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdf830c032c2ccb4cc512b0544e234c0 SHA-1: cce598ecf9862985f97f171cd7bacd9546f12417 SHA-256: 78909a2e5ba0f096da72db2f60e3be4d1fcd6991d4955201a21f3a525dbd2a1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links pointing to different domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://strongpointmarketing.net/userfiles/file/40461580590.pdf In PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/98191903139.pdfIn PDF document text
    • http://lukinserv.hu/file/7673731254.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/53866063574.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/dazugazipelulov.pdfIn PDF document text
    • http://levotst.com/uploads/files/xokonotapa.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/37630230148.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/poduwuloxitekifef.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21a786141---89789624497.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n9auvsusdg4onr7k8f2jvp1akn/57775611316.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/48640170645.pdfIn PDF document text
    • https://egf.tw/test2/images/file/jumopajepikudatagafawe.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/kufakebumomafabo.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/sukobukaderegijexupilof.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/xeserodebiterelera.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/81948751750.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/nozaju.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/78352730976.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202193845507367.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/taxumotudalos.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/tarisurexilelawunutif.pdfIn PDF document text
    • http://tochalco.com/uploads/files/192600194.pdfIn PDF document text
    • http://rcmo.ru/upload/files/56473495981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=american+honey+online+freePDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 18236 bytes
SHA-256: 0c1d93a9e94aec4eeaad99afcd7f482d3789d70e028090f4248607dcda6f7d1d
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 10428 bytes
SHA-256: a86a15742ef88f1de12913a7a75e9adc9f96a1462757b3f4ebbe326f6eebc646