Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41091c27edc6d1…

MALICIOUS

PDF

89.0 KB Created: 2021-04-19 12:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6abf82e6803cb9c0eeaae0796593a7a7 SHA-1: 72d531f6e233db7e7701e8a9cc4999cf76c5ce4e SHA-256: 6f41091c27edc6d1858b67920c57c557c9b10e05c758f9b7edcea28664e305ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain known for hosting malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating link farms on disposable hosting, often used for phishing or redirecting users to malicious sites. ClamAV detection further confirms the malicious nature of the file, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=modelo+atomico+de+dirac+jordan+y+sus+caracteristicas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455657/normal_60347c76d07ff.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/how_to_start_a_drawing_youtube_channel.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/xIwRgj2/what_color_tube_for_fasting_lipid_panel.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/pengobatan_carpal_tunnel_syndrome.pdfIn PDF document text
    • http://vekenuv.iblogger.org/6627052676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fef6d49cabe4.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/i9igjhi/61594003251.pdfIn PDF document text
    • http://mipefukonuvav.iblogger.org/tavixemoj.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/hdJv1ij/47938138568.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekajebema/eihjh9i/rotudanijeravopuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/8n1FhhG/they_play_tennis_in_french.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/74921168162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_359efe213e4a4ac08ec13777d402d08e.pdf?index=trueIn PDF document text
    • http://fozovevozasox.epizy.com/kamakura_day_trip_japan_guide.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/exam_essentials_cae_practice_tests_2020.pdfIn PDF document text
    • http://lukoleni.epizy.com/lubak.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_0d6f4d63e443420dbdb2fde033a9b999.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_e6ccf309330444a5a855959d6293038d.pdf?index=trueIn PDF document text
    • http://todetizos.epizy.com/wiregumugixugaputi.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_dad21faa8fdc425db88e340e62baf8d1.pdf?index=trueIn PDF document text
    • http://fusaxisedafi.rf.gd/happier_piano_sheet_music_with_lyrics.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/astronomy_magazine_free_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 5152 bytes
SHA-256: 07b88946a7e12299201daefdc00efe931a066f9ff666694ad998dd869f2db9ee
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 13304 bytes
SHA-256: 5a9b7650b076a2b83df8b68128178e997ff43a4a6ae2e1fa47ea55fb28c0ffb5
font_02_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 16256 bytes
SHA-256: 36aeda29b5b94ce1e3a606ebf79de5d3b9ad402616b5c527f81ae1728ab8f8cb
font_03_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e