Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef4090a225186f7…

MALICIOUS

PDF

108.2 KB Created: 2021-03-23 12:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 82d4c370221bf83c8b41ef572b9fe514 SHA-1: 6418e16381143deed240414cccffc6546852e4f5 SHA-256: aef4090a225186f708da18adf9c437afdd22505a196d592830c762a9e6046a69
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links pointing to external websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to a malicious site or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=%25D8%25B9%25D9%258A%25D8%25AF+%25D8%25A7%25D9%2584%25D8%25A7%25D9%2585+%25D9%2581%25D9%258A+%25D8%25B3%25D9%2588%25D8%25B1%25D9%258A%25D8%25A7 PDF link annotation
    • http://firejifanop.iblogger.org/is_rhythm_guitar_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/hhLTtCt/earthquake_map_san_andreas_fault.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/netopidodubixirekuxazak.pdfIn PDF document text
    • http://valaporinepisu.22web.org/wawidizavafiz.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/kopuxesaraxekazagek.pdfIn PDF document text
    • http://buxuzexutotuf.22web.org/array_c_program.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/53057852192.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/YByq2hf/clarinet_concerto_adagio_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/jjgjxhd/vilagalovakiro.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/fAjaNjj/bitalozupufewebi.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/samojixanezetimajolukudoj.pdfIn PDF document text
    • http://lekezoreg.22web.org/90368405120.pdfIn PDF document text
    • http://rofogukiluvupu.mygamesonline.org/daily_tamil_news_paper_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeburam.epizy.com/personality_disorder_worksheet.pdfIn PDF document text
    • http://puriruf.epizy.com/72313132797.pdfIn PDF document text
    • http://xuresiru.epizy.com/formule_annuteitenhypotheek_excel.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/soxararulatujodokerizupop.pdfIn PDF document text
    • http://solezod.myartsonline.com/effect_of_acid_rain_on_soil.pdfIn PDF document text
    • http://solazagu.epizy.com/98542388665.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016827.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16827 32512 bytes
SHA-256: 2550b09bec76feef2f9958b45ee4dd8e247d8b018575caf30bcd66b09817f105
font_00_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 4068 bytes
SHA-256: 715b03a136136d3e46c7849768d9b7044afc88c0802cefcaa90209915fa1392d
font_01_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 9560 bytes
SHA-256: b8ec28a4a66f015f0ccd14dbeaeeb43780c0f1e9562ee69eceb22386f6789c2e
font_02_sfnt_off00014d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9F 17560 bytes
SHA-256: 320e056e4117c9ed7b78f62db08f5cca3d31874edb8f4cfd0f11b7b54a14fe0d

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