Malicious PDF — malware analysis report

Static analysis result for SHA-256 66787ecca01bc342…

MALICIOUS

PDF

76.4 KB Created: 2021-02-16 05:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bd7e4fa0407ffc6ae32c4d299b55ecd5 SHA-1: 3b9c3d8be4835b43d8ae2209f5cb9dea26064ab7 SHA-256: 66787ecca01bc342cf6b21d067bd1a62c81ea2803b9b892866afb822da52490b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to disguise malicious links within seemingly legitimate document templates.

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://bologen.ru/wb?keyword=what%20does%20strip%20means%20in%20english PDF link annotation
    • http://bigwin-1xbet.fun/31377589807k1het.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bWdlhbZ/1089390433.pdfIn PDF document text
    • http://gakmancreatures.ru/bostitch_6_gallon_air_compressor_not_working87ynv.pdfIn PDF document text
    • http://bnatural.space/anthropogenic_hazards4ovx9.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/dhg44k0/fusezanodis.pdfIn PDF document text
    • http://obuv-kozha.ru/hernia_inguinalis_indonesia3z33k.pdfIn PDF document text
    • http://bezigex.iblogger.org/symmetrical_worksheets_for_grade_1.pdfIn PDF document text
    • http://mevilesiroxivo.iblogger.org/fexamanufuwop.pdfIn PDF document text
    • http://seamanygau.best/6.5_creedmoor_load_data_imr_4350766m0.pdfIn PDF document text
    • http://cg-designer.xyz/mojebefijepukelalesizilfn5hj.pdfIn PDF document text
    • http://tersq.fun/papon2pgg1.pdfIn PDF document text
    • http://my-favshoph.online/garodoselamulowumegbv178.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/gfMjcdi/92286777706.pdfIn PDF document text
    • http://lishop.site/fallout_new_vegas_sexout_crashb6y79.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/3G63b0n/duvukerobufogosu.pdfIn PDF document text
    • http://vuvefezod.iblogger.org/compound_sentences_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekobovovexi.epizy.com/address_book_template_google_docs.pdfIn PDF document text
    • http://migegavirunafo.rf.gd/cheeni_kum_songs.pdfIn PDF document text
    • http://zaxexopufo.epizy.com/bracketing_commas_worksheet.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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 5384 bytes
SHA-256: b2f821b96c5f09853039f82b604e259e61d0dda46093fe1b8807e7b681e531e6
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 10156 bytes
SHA-256: 78338ab4d3de55441739e75c24172957ce1a074b1d3398855f956a2351e2ad9a

Open this report in the interactive analyzer, or submit your own file for analysis.