Malicious PDF — malware analysis report

Static analysis result for SHA-256 9715ff157554a4fc…

MALICIOUS

PDF

82.6 KB Created: 2021-04-17 07:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89233515e08ce97f18cc7685e8d63bd1 SHA-1: dd2035b8aa3d148224e1a192689256cf57c4d41c SHA-256: 9715ff157554a4fceec848b738a134ef83f564033fa9f2b619bfe8418938aae1
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9991

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=earth+science+guided+reading+and+study+workbook+answer+key+chapter+22 PDF link annotation
    • http://all-casino.xyz/positive_affirmations_worksheete8m4s.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/the_abominations_of_yondo.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/tumaczenie_zda_jzyk_angielski.pdfIn PDF document text
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/powazewatiladizurov.pdfIn PDF document text
    • http://idealicaitaly.site/9391836273584efk.pdfIn PDF document text
    • http://gallery-shop.site/jolovezanuynm.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/radukibufugowi.pdfIn PDF document text
    • https://sunitago.weebly.com/uploads/1/3/1/8/131856801/d1ee6e35d.pdfIn PDF document text
    • http://javifimawa.mygamesonline.org/critical_thinking_activities_in_patterns_imagery_logic_answers.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/ashton_sanders_wu_tang_clan.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/0d6ab56.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/alone_in_the_universe_sheet_music.pdfIn PDF document text
    • https://goluluvofa.weebly.com/uploads/1/3/2/7/132712214/nebanutiv.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/23492042573.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/jokigiteva.pdfIn PDF document text
    • http://discount50it.pro/tumegasezq4kvr.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/bostitch_rn46-1_manual.pdfIn PDF document text
    • http://morj.space/schedule_template_pagese5m07.pdfIn PDF document text
    • http://pelistens.xyz/xakijodunuxogoxapegonafawwd4lo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/burubobukaloxat.pdfIn PDF document text
    • http://gavofime.atwebpages.com/sat_math_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/sipesitemugeser.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/bach_goldberg_variations_piano_sheet_music.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/describe_the_different_types_of_heat_exchangers.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_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 5788 bytes
SHA-256: fb8583be47c56eab1d4ef029932fe144b0ca6859a805c78f3793c69d093c8eb1
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 11324 bytes
SHA-256: 1e3d118ab8fe1c231759837d9f7cf770aa718435573f78111586ebda1dc5b6f8