Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcf697019277a4e…

MALICIOUS

PDF

73.9 KB Created: 2021-03-14 14:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b0bf13ecfa8a9f4854b71bb332e3d67c SHA-1: c839ed81b92c125ef71f3cf296ccec7588904e6e SHA-256: 1dcf697019277a4ed1fe9efaad2f108f63090169468634fb2c83383b306e7c84
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://dafemum.ru/wix?keyword=brain+clip+art'. This indicates the document is designed to lure users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/wix?keyword=brain+clip+art In PDF document text
    • https://cdn.sqhk.co/fewibefanid/Fjaicic/infinity_symbol_on_keyboard_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/iumAGhf/tyco_slot_cars_sets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fe1511663954.pdfIn PDF document text
    • https://cdn.sqhk.co/batitiviz/gdZjdzx/marsupializacion_de_glandula_de_bartholin.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/jddhfZL/61557589268.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gegihhp/xusugufurakixivojanelirel.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/eZ7mYih/directv_channel_guide_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_602264f1c24ed.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/hehnges/smart_connect_reel.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/VjfjfGZ/77246375462.pdfIn PDF document text
    • http://pubgmobiie.com/4th_grade_math_worksheets_long_divisionck26n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_602c706c1a947.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/hdVRuPj/make_a_cake_cooking_games_similar_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/ibUvXha/average_cost_for_health_insurance_under_obamacare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410985/normal_5fdcb29fb60ed.pdfIn PDF document text
    • http://it50disconto.pro/neuro_emotional_therapy_trainingyfslo.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/s2lifZv/title_page_of_a_report_example.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/30iaidR/gadewalovazawifefukebu.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/feborobegibew/before_the_flood_worksheet_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/world_history_world_war_1_test_answers.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 4796 bytes
SHA-256: 64f65202d9e35d46c93bbebdfaed1105d4dd55680ee7f6ab6dbf6fa379529a38
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 11068 bytes
SHA-256: e81b0eecd9b6a8f69a0dd01aa76d9a5173df6b6a082fee9c90eef3c05671db3d

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