Malicious PDF — malware analysis report

Static analysis result for SHA-256 440dde1d6bae96af…

MALICIOUS

PDF

72.4 KB Created: 2021-04-06 14:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b9b3f315fe928460893091a9fc7daf0e SHA-1: 9897820d61844fc140718f955fd900012ccd4ba9 SHA-256: 440dde1d6bae96af55f626ca5898e63a2899ea8277b47af9f448a3da4cc69760
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'download button' lure and numerous external links, including a link farm, suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=cambridge+certificate+in+advanced+english+3+complete+book.+pdf PDF link annotation
    • https://cdn.sqhk.co/wupetutigo/rhdkKCm/chaos_rings_3_mod_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/0hchh2u/classic_solitaire_klondike_no_ads_totally_free.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/plantronics_cs530_instruction_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/NjjgDYF/share_chat_helo_video_download_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/hjjf56O/online_chat_rooms_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxopejitin/fhg1hdr/download_game_strikers_1945_world_war_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/sidawet.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/42385749542.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/food_network_uk_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/19655276603.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/63846794611.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/instagram_for_android_4._4._2.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_dc2dc2d0685044538390977a51ac10c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/us_visa_lottery_application_form.pdfIn PDF document text
    • http://gufopexolax.myartsonline.com/aristotle_nicomachean_ethics_irwin.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/botegep.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_67323a4251f14d77a471c7cdc8a38cda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xubifupi/423844766.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/rasipifafefovuma.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/99103383568.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/penunaleragipazoxiz.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_182d5e9b310c4b4095899a1b554f88e5.pdf?index=trueIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_96dc27fedc39468bb588158f05c06dee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/49247536522.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/red_rising_book_1_chapter_summaries.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 3176 bytes
SHA-256: 50fa04ef4b499e0d24a3ffb993c0a788da24b55ccb4e92d0f09d412406e3d69d
font_01_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 5932 bytes
SHA-256: 9d3501c3ccc8f10229b511c4bc7d0f4b7706fa16f845edf437ffef31b2864e1c
font_02_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10564 bytes
SHA-256: 5083833343cb8ed5e2f5d960ad757919a643b5bb92e2d4b4a2f898513f27abcd

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