Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e55e5456c3c8ee1…

MALICIOUS

PDF

97.4 KB Created: 2021-03-11 11:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 807e882ba5a55d665e0690a7480e5733 SHA-1: 114ff6ac3d388cb0ff5750b06da706993b805c0e SHA-256: 9e55e5456c3c8ee19949f2e823ec4f497ce8349cf73c16dcd9b0bf64f9549264
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nipisod.ru/wix?keyword=asplos+2020+acceptance+rate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6018daa34ee46.pdfIn PDF document text
    • http://heliusdesign.ru/59353726274y8d5m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5fceb086a3973.pdfIn PDF document text
    • http://kind-insta.site/formato_apa_bibliografia_video3hn2m.pdfIn PDF document text
    • http://eurofamily.pro/bipepevasizesibazekm2.pdfIn PDF document text
    • https://cdn.sqhk.co/nunepokuwe/Ab0Wrgh/86964165136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_604387f2ea6e6.pdfIn PDF document text
    • https://cdn.sqhk.co/jubelupubex/icJU02H/23788048875.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/MhIa2jg/minerva_mcgonagall_cat_fanfiction.pdfIn PDF document text
    • http://genusadnlo.space/definition_of_library_resourcesrcqcl.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/ghfibOb/fish_aquarium_close_to_me.pdfIn PDF document text
    • http://micrometer25bill.site/easy_tricks_to_learn_formulas_of_surface_area_and_volume1dohp.pdfIn PDF document text
    • http://lupexovagin.iblogger.org/turaxozativi.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/jHyhbav/aurum_blade_ex_cheat_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepokubomime.rf.gd/tafufisux.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/math_worksheets_grade_1_multiplication.pdfIn PDF document text
    • http://rerezedosal.rf.gd/gakesuxud.pdfIn PDF document text
    • http://mefozovoluneje.rf.gd/8498310451.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/dazuxatobeb.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/15423060009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5fece9-9e24-41c4-9507-532b588eba83/zisugefemebonulurebafex.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/100_doors_puzzle_box_level_24_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca7f66e-9c4a-4ab4-b8a4-cababf89d7ae/bidis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a8e649-16e3-4a09-b6c3-0e386fbab5e5/how_to_install_a_tankless_hot_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec450ed7-b1d0-4bb2-bedb-e1768c1e8fe3/clicker_products_programming_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49371b30-f11b-4634-9887-b150d9437077/43750564650.pdfIn PDF document text
    • http://fatugogav.rf.gd/phonics_worksheets_for_first_grade.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_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 5192 bytes
SHA-256: 26d248e31e7d4d117ed39356fc4de3384ce4eb5ebe43c5badd04fb161d8cffb8
font_01_sfnt_off00015387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15387 10812 bytes
SHA-256: 6e291b5483414a1e7b38dc981363122355ebccd666489bc99bdfc15633475621