Malicious PDF — malware analysis report

Static analysis result for SHA-256 816a8a7b9389a437…

MALICIOUS

PDF

70.0 KB Created: 2021-03-27 12:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12dbd58d6e1aa44beaa170c5e246458a SHA-1: 9b76b7de703ad54e43d5a1c5e709419d7522e179 SHA-256: 816a8a7b9389a437d57c9ae4e4acfe76db579907d2afca99ce66c4892dfaaf62
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs, including 'https://pelibifir.ru/123?utm_term=crystal+reports+sp21+for+visual+studio+2017', suggest a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains strings related to software and reports, aligning with a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=crystal+reports+sp21+for+visual+studio+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477638/normal_604feca40a32e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_6027c024d82a4.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/chemical_kinetics_and_dynamics_steinfeld.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/beauty_and_the_beast_musical_full_score.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/finance_business_partner_job_description.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/meaning_nature_and_scope_of_educational_sociology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6042e3e5802d5.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/why_doesnt_my_nespresso_frother_work.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixomirorubu.myartsonline.com/95695279996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ae8aa0-c6ba-4e9f-9620-a46989a3fd8b/enter_the_unknown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7633a57-c48b-468b-9a1f-5b39d22c020f/robowadex.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/gupalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c18d7e-a271-4b6e-a416-6d5830c3f10e/regotepononobo.pdfIn PDF document text
    • http://viwudajokufado.atwebpages.com/jimawugogawebinuwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f29332-abdf-4134-80f8-f851f0579374/nozalababanopapufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0faadf6-a355-46a0-a1ab-df179fbf16e3/sawutobedap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc1178e-1b4d-492d-8e9a-32b8c7dfbf75/sql_for_dummies_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b08a717-0732-40a1-9813-01749f770e2d/dell_inspiron_n5010_core_i3_drivers_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/android_girl_vocaloid.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/niv_life_application_study_bible_third_edition_review.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/29864613947.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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 5508 bytes
SHA-256: 95686b1c5b0217072e0241cb717c298c7a7bfa9ad0f203a876a2efe73bbb2490
font_01_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 10276 bytes
SHA-256: a6c105f92a1515d0edd0b3ce9af3a73dfa80e8c58173066eb0b1f8095f9a58de

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