Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a907fd60706866…

MALICIOUS

PDF

85.4 KB Created: 2021-03-01 02:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00a3918fd60377d2790ec83303d2f5cc SHA-1: 5d7a36da7454d9040cc5d2ce018e8fee22a5044a SHA-256: c6a907fd60706866789afc44a3acb05c7e3c67703f8246f9c03405fbed7afe67
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including those on disposable hosting and link farms, suggests a phishing or scam campaign. The document body, though heavily obfuscated, contains references to 'worksheet pdf' and 'wkhtmltopdf', implying a lure to download content, which is further supported by the 'SE_DOWNLOAD_BUTTON' heuristic.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=writing+major+scales+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/tixunudixa/jimgiid/72960249874.pdfIn PDF document text
    • http://5-euro.info/fujedozkxkr.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/hdzNvsw/motogp_racing_17_championship_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/hacjhjd/71713658974.pdfIn PDF document text
    • http://sodalabs.club/61130818362pr84s.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/gisiahe/us_world_cup_soccer_championships.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/cIv5wp0/83147389589.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/fW89Irn/business_plan_risk_analysis_example.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/gglR06b/twitter_stock_down_today.pdfIn PDF document text
    • http://sokolov.fun/wordpress_themes_for_artistsx3g29.pdfIn PDF document text
    • http://livethailand.fun/88995348219um90s.pdfIn PDF document text
    • http://help-copyrightservice.xyz/wuzaberotivetisifowosyyl3e.pdfIn PDF document text
    • http://winclean-shop.space/hieroglyphic_alphabetls1h6.pdfIn PDF document text
    • http://reduslimitaly-official.site/79491937731twtla.pdfIn PDF document text
    • http://xuxugagutosi.iblogger.org/pupewaju.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/jzSfLOR/42385315816.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/O8hijek/spongebob_moves_in_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapivevo.epizy.com/archery_king_full_zoom_mod_apk.pdfIn PDF document text
    • http://loxosufodu.epizy.com/finances_excel_sheet.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_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 5816 bytes
SHA-256: f4f2c321b31a707de1dfce00db2299285c8f6e69fc12ec8ef089d6d7ab409347
font_01_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 14196 bytes
SHA-256: f0fb6506b55d3eacc622f6c3d8db0107630ff35a572d68edb3cb85e53c27db19

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