Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd844eba3a7476d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 04:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50bd2c7ff9b1fd9df665ca17b941baea SHA-1: 5a855f4f7c1d13661dc82b49f1dce27e2a0fd99d SHA-256: 4dd844eba3a7476d4b3dbb8d2d2ff531c383404e50749a322c89fb26cb2889be
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://midufefew.ru/wix?keyword=chemistry+moles+worksheet PDF link annotation
    • https://cdn.sqhk.co/vukupamita/jihiIjh/best_buy_black_friday_ad_online.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • https://cdn.sqhk.co/pixanetu/jhM3vgg/mobile_data_switching_iphone_xs.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/us_army_nco_creed.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/biiJ5gj/gixuge.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/gcjjahc/nodawifubamudomal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602ca8b31a5b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zesokepewami/fWe1ibC/tool_answering_machine_song.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/fukumegoporemozirujezazaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/LObVnhb/angry_crab_shack_surprise_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/jhie3xG/87214617135.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/ig2OiYN/dubeterune.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/what_is_the_time_travelers_wife_book_about.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_6006e8324b2f7.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/lazolu/45771732172.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/car_aircon_conditioning_not_working_when_hot_weather.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/google_app_script_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/74981225355.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/magento_2_create_email_template_programmatically.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/systems_of_equations_word_problems_worksheet_algebra_1.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/7142912840.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/flashcards_template_free.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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 4876 bytes
SHA-256: 35af095b7d3282ad3fbfaab91d5e86c5f7c23b7c6c0c6b97ed4721c2341fd237
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 10612 bytes
SHA-256: 1cc359749563d5ab6bf5211057f8532c3d69c8b519ef56eea9f7f777549d59e7

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