Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a346307f2aaa7d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 09:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 56b16cd61ae0b5e2255bb2db7287d96a SHA-1: cf6420fd38d969205d138b49b5a2178450961e26 SHA-256: a4a346307f2aaa7d4b059d5ed661f3e19e2f8fce0c422c3d109e5b9f8450f858
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/123?utm_term=rise+of+civilizations+guide+city+hall+requirements PDF link annotation
    • http://peuly.xyz/control_systems_engineering_course32kf4.pdfIn PDF document text
    • http://topstudy.fun/96386974861xn81z.pdfIn PDF document text
    • http://dalnoboyi.xyz/183931205985np2t.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/sat_subject_test_qas_reddit.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/livro_como_trabalhar_para_um_idiota.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/jipowumat/paninizutesojox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b0583f-fbac-430d-b94a-4c34299af8b4/pikivonowatuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b2992-698d-4b0d-809a-b20108c2d6b9/tuck_everlasting_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162d0479-7975-451c-9e1b-5d6931ca26ae/bryant_350mav_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3b5e36-d919-4638-9df5-9de0631ee125/jiwuviziwonadolinitameg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e791e1cf-756d-4f26-98a5-9c861c0aa2d4/how_to_fix_e5_error_on_hisense_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83e28a0-d072-46a4-9604-3c13314b3112/fiwejo.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/the_fall_of_troy_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/symmetry_art_worksheets.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/livros_para_iniciantes_em_leitura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f051b1cd-aaa7-4be5-899a-fc7724f2b144/fupivarexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b49f0a9-0ac6-45e6-9fa1-b7a9becffcb3/the_shack_movie_online_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/29127467741.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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 5780 bytes
SHA-256: 75c5828bfcb0583a58bcb65a5f5b95d94b8c02a73da957a73e0abc63f76573a0
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 10600 bytes
SHA-256: 66e6f93aed0b45fe059f4cfa8e54817a660999a76fa37fc8245790efbc9127f8

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