Malicious PDF — malware analysis report

Static analysis result for SHA-256 366e3b66e861e482…

MALICIOUS

PDF

83.9 KB Created: 2021-04-18 02:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4ceb208f347985b08c71ac3af19952f SHA-1: 857ea7d9aeacd6341faa11e66b44aa7bbe3a6d15 SHA-256: 366e3b66e861e4826305a29bed7d98bd217887d835275bcd75a6fd039a53f035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=what+is+courts+of+heaven+teaching PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392474/normal_5fd78f1682bfd.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jB2C1jh/memizufokotiwin.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/ydjesja/throne_of_eldraine_brawl_decks_reprint.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/ex6bgcR/lesson_plans_4_teachers_templates.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/84942779325.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/calendario_2020_diciembre.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421201/normal_5ffa2546a1c24.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/ihhhgfP/black_beauty_trailer_song.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/d0smAgi/22687015801.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/niwabevijizanulawafevek.pdfIn PDF document text
    • https://cdn.sqhk.co/mimizajig/jnfjiPO/juvede.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/J4QCgdg/76392671041.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/bitepexakefamijuxak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://derekage.epizy.com/sputnik_sweetheart_haruki_murakami_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/zuwugofaselolezolan.pdfIn PDF document text
    • http://fudedeki.rf.gd/productos_notables_binomio_al_cuadrado_ejercicios_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/utah_wildfire_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/primeros_ensayos_augusto_comte.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/antibioticos_uso_veterinario.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 5184 bytes
SHA-256: 1a3f209fb7a6c6dfbf32c42e455db0860937a61f86d75896110063288bd09542
font_01_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 11724 bytes
SHA-256: e4432a22a7f784746ac395f40f8987bbbeeb0fcda8126c094a155b5677497e6b