Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca8943481684298…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 17:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d102f0e8885eef9ca013dae32b4c5265 SHA-1: 58c4a3f1b653cd2cb2d2f7531b72cab85da19f0b SHA-256: 7ca8943481684298b6935c36c0c22c9afc9d49e5663af07424c4572eaef6f93d
126 Risk Score

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. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=probleme+chimie+anorganica+pdf PDF link annotation
    • http://hyipinvest.site/donkey_sound_ringtone_downloadys3ai.pdfIn PDF document text
    • http://presentinsta.site/515901952700asx8.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/miepnIm/gantt_chart_weekly_excel_template.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/why_won_there_be_a_3rd_percy_jackson_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/ggdbjar/juventus_u23_fc_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/eygjBQG/limazifovenexepij.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/hihaiNE/marketing_plan_presentation_template_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/icphcsE/tusiwewadokozibozurir.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/0cidbib/72188186775.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/cWgrdgi/fruit_slice_master_fungo_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/gfid5hg/7339087747.pdfIn PDF document text
    • http://makeyourself.xyz/tewuriym6nl.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/p61jihj/mijipokubajuwupis.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/hcjhUjf/traffic_racer_hack_ios.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/fedex_customer_service_job_application.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/68553828959.pdfIn PDF document text
    • http://presalle.xyz/vebafukugafizupakoton245nf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/cradle_to_gate_vs_cradle_to_grave.pdfIn PDF document text
    • http://gevalej.epizy.com/best_telugu_movies_2019.pdfIn PDF document text
    • http://situxunekidini.epizy.com/du_video_screen_recorder_apk.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/bodmas_questions_and_answers_for_class_5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 5532 bytes
SHA-256: 25dc1214bdc1f42bfd819910e6b33b90fbf4f090747f882ef690fd0ad4df6f38
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 10836 bytes
SHA-256: fdfdce0dcbd848779c6681acb12a8d1b960fba27d5f1a54fe0b364799260acb1
font_02_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89

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