Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac5598f26f90ff3…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 02:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 794fd8b06f71226f67035ec7a4d9182b SHA-1: 1f0c2649fd09691ef63f9fd8dc5f543417e9bf0f SHA-256: 5ac5598f26f90ff3788a08d35713494d393548edbbcec18142760529bfc98b4f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to 'seumenha.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/wix?keyword=mad+arrow+2+unblocked PDF link annotation
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/0ea7896af0323.pdfIn PDF document text
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/7797821.pdfIn PDF document text
    • http://digitalcalakk1.xyz/river_runs_through_it_movie_quotestnirp.pdfIn PDF document text
    • http://naturwow.space/trombone_quartet_sheet_music3p7y7.pdfIn PDF document text
    • http://nakonuvexurilov.iblogger.org/baby_bjorn_bassinet_review.pdfIn PDF document text
    • http://ledimpress.biz/critical_thinking_the_art_of_argumentk7uhl.pdfIn PDF document text
    • http://copyrightsupporteds.com/70669120037na7xz.pdfIn PDF document text
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/7255227.pdfIn PDF document text
    • http://fanuvowebutil.22web.org/64901974600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekevidijonuji.rf.gd/letter_e_tracing_sheet.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_fd09c343f55a49d291ecc185fa1e90fd.pdf?index=trueIn PDF document text
    • http://regenazuwirege.epizy.com/lagu_betrand_peto_sahabat_kecil_ku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97aa521d-6fb1-4477-87e9-86217fb37560/appointment_in_samarra_sherlock.pdfIn PDF document text
    • http://jemekeluvakowop.rf.gd/review_cobra_walkie_talkies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9b2923-582d-4bc6-9638-cf76e92d6b2a/verifone_ruby_2_commander.pdfIn PDF document text
    • http://nirirojigupe.epizy.com/zadedenijevuzemimodiz.pdfIn PDF document text
    • http://simabox.epizy.com/28268002402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2aab15-1b8a-44a5-bcfa-28d10009d42e/e5_eval_closing_statements.pdfIn PDF document text
    • http://poliwukumepi.rf.gd/how_many_pages_are_in_insurgent.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_a1086f946c664f2090808de523403921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3d501c-d071-43eb-a572-74e37bb7d956/55030285588.pdfIn PDF document text
    • http://govusilewirot.rf.gd/tenejije.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_efcb39c33ebe4546adb21c693faf4dc4.pdf?index=trueIn PDF document text
    • http://zefixufedinokas.epizy.com/kms_activator_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504432d6-445d-49e7-a486-cd771498a65f/babejon.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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 5188 bytes
SHA-256: fd6e6f944f3f2e7985f6cacf39a7bad09e22a92d13069c8f8c688503f3ac8974
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 10980 bytes
SHA-256: 70e31f8a1582445ea3745cc91ca79cf53a8930c9f39ebf24eb8e1bb0f2e02507

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