Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e3ef191b1b4563…

MALICIOUS

PDF

83.8 KB Created: 2021-02-16 21:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 107eff0b6729b3b0fd3d6250c409bf47 SHA-1: f66f911115a72b9c6fce6480546754d814a2d6c6 SHA-256: 13e3ef191b1b4563e168c1bc95cf9af04359962771ea460874d0c5054257874f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=types+of+windsurfing PDF link annotation
    • http://cardioactiveuficiale.site/form_page_bootstrap_template_free27kt9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_6024ef67c5c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60294d9fa845a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_601a31cc138d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fd65f27f2f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_5fdc09e1b622b.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/hhhGjgk/nupol.pdfIn PDF document text
    • http://xivusolokedujes.22web.org/4-_3_congruent_triangles_worksheet_answers.pdfIn PDF document text
    • http://pochta-24.cc/usda_healthy_eating_guidelineszyaaq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fd7d129c3c68.pdfIn PDF document text
    • http://mexicotop.xyz/11487040224mub8n.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/kutibevuguzete_rurojawabime_tawotuketowir_piduveka.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/aio1ign/rawanugibebav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489244/normal_6001461724276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipimov.epizy.com/chemistry_important_notes_class_12.pdfIn PDF document text
    • http://gonuzalujulogab.rf.gd/total_conquest_offline_unlimited_money_apk.pdfIn PDF document text
    • http://kisitibonadal.rf.gd/cydia_apps_over_100mb.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 5112 bytes
SHA-256: d27b8309387222967e8e3106bcc9d62044a2dd8b9f5bdd79cc04433dd4f29536
font_01_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 10200 bytes
SHA-256: 1d866018cb7462ed9755d219570ec7f620dceefe1ea04a0fad6872e779c1fe58

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