Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc3102191ddf126…

MALICIOUS

PDF

84.1 KB Created: 2021-05-01 09:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a6c6f579ee12fbca11f560c7d3e3a981 SHA-1: 9df865f3d7af5b792249ae9e017bd79a9dd1bfb3 SHA-256: 5cc3102191ddf1269f1f20c5abbc2f6ab154b6a194ccd88bec49f4443300ae2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to programming a Dynex TV. The presence of numerous external URIs pointing to disposable domains, as flagged by PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggests a phishing or redirection campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=how+to+program+dynex+tv PDF link annotation
    • http://midikakuvekume.mywebcommunity.org/56330389457.pdfIn PDF document text
    • http://fc-aromat.ru/17186204377pc0dh.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/caranx_hippos.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/anticorpo_monoclonal.pdfIn PDF document text
    • http://didazema.mypressonline.com/algebra_2.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/mipagimawizolerub.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/ramurumuto.pdfIn PDF document text
    • http://hempmap.ru/what_is_nautical_knot13jum.pdfIn PDF document text
    • http://lowevujum.iblogger.org/xomavezudanowetumubaxoju.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/vodajotebiripenaxolul.pdfIn PDF document text
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/7bb7964.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/que_es_el_bosquejo_del_metodo_ejemplo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9043af40-d19f-47a4-9653-924b44915318/27433683240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5285197-492d-41e2-b8b0-013102969d91/tapitogetiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58539ae-4d00-4639-8e93-43d1620e6446/1455922128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850874c6-6144-4e6a-adb9-3f8f6d6c2e85/wemavadejimi.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/967395595.pdfIn PDF document text
    • http://jufogitomob.onlinewebshop.net/bifomenofa.pdfIn PDF document text
    • http://nubirumoxid.onlinewebshop.net/call_of_cthulhu_download_rpg.pdfIn PDF document text
    • http://xukorigukem.rf.gd/rules_of_chess_game.pdfIn PDF document text
    • http://dexupanuwobazab.rf.gd/tubolovubepumefi.pdfIn PDF document text
    • http://retuguru.epizy.com/aperturas_modernas_de_ajedrez.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_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 5352 bytes
SHA-256: 85df164f833e0b1fa27deac0d1a90f547a516f146f03537e10a6b924838bc539
font_01_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 11196 bytes
SHA-256: 60d95b939c90ed162171bde92ffc43320a102e23f07aee7dc7f3b843386e10fe

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