Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7b2c5c7599a4d8…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 06:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d351a513b91464688875edd3e8a4a0ec SHA-1: 87518e4eaee4a67761b029d40804ed17c73b6bf6 SHA-256: 6c7b2c5c7599a4d85d5bfeab84d960d649515f5ed888facd213efb805e422a4d
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://lozipotod.ru/award?keyword=punjab+benevolent+fund+form+2020+download+pdf PDF link annotation
    • http://gupirod.iblogger.org/ielts_writing_task_1_sample_answer_band_9.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/biochemical_test_for_microorganisms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5fe3eaf91ec9b.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/haCjiij/brain_training_games_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/UDiggeV/21622994381.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/gjgV8gf/ball_100th_anniversary_blue_mason_jars.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/eiageyv/gevutawosinef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_6010b4dc1659a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5ff6593a3af84.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/JhiYBNZ/ninek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff1798a3c7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_5fd876b22cb58.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/exemple_cahier_journal_enseignant.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/jshgigE/lord_mobile_battle_of_the_empire_mod_apk.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/zemunomipazikez/liquid_waste_management_system.pdfIn PDF document text
    • http://xawavejemefo.epizy.com/kindle_ebook_format_umwandeln_in.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/bureaucratic_structure_and_personality.pdfIn PDF document text
    • http://tarusuja.epizy.com/36083870005.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/53011425792.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/how_to_send_someone_video_on_facebook.pdfIn PDF document text
    • http://guwidovelix.rf.gd/how_to_clean_a_bissell_powersteamer.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/echo_dot_3rd_generation_user_guide.pdfIn PDF document text
    • http://guvivel.rf.gd/29719304395.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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 5652 bytes
SHA-256: a82ff5201df7a12f0f9e5483715d1e112983b9002159d874e9bd05b4742fd226
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 10700 bytes
SHA-256: 32bb7f3a548fb57f9d20f5e6d8ef65e9e052c8a85b15d3d0df32c0b72b4c1cc8

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