Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f6c95ee568bb31…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 09:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed6220df7a9628f00fce364f686e16f7 SHA-1: 86194e1ae4e2e78681ac8fcffb212a7a4945e303 SHA-256: c9f6c95ee568bb31c97fca4e409386c5943f53fc1e86971a70dfbd2c9a5a4476
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an external URI pointing to 'xajibur.ru', which is likely a phishing or malware distribution domain. The PDF's structure and embedded content suggest it's designed to trick users into visiting this URL, potentially leading to further compromise. No scripts were extracted, but the presence of external links and the overall heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=how+to+read+body+language+with+pictures+pdf+in+hindi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ff2b598bfd02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_60207b0a30928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff264dcd6a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_602be78feea32.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/jjgdhib/warhammer_adventures_attack_of_the_necron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_603a85722a6ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454965/normal_60065e7c8a8d1.pdfIn PDF document text
    • http://guwobedegaf.22web.org/osmosis_imdb_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/luridixajix/jbXhehc/informante_privilegiado_definicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_604100abc847e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fadobirak/numpy_for_python_3._7_windows_10.pdfIn PDF document text
    • http://sirirowevaga.rf.gd/34308738227.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/47114342348.pdfIn PDF document text
    • http://zotapem.rf.gd/private_instagram_videos_on_computer.pdfIn PDF document text
    • http://fezovinu.epizy.com/application_letter_for_a_job_vacancy.pdfIn PDF document text
    • http://rewexukid.epizy.com/1._antecedentes_histricos_de_la_administracin_de_las_operaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/how_to_use_p_touch_1000_label_maker.pdfIn PDF document text
    • http://rojazudawawuse.epizy.com/matrices_matlab_tutorial.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 5596 bytes
SHA-256: c85319d52a2876566346ddc82f398000b6611adb4cf871850e98941b62fb6b7b
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10876 bytes
SHA-256: 05fcdd08daf6f1c42e95d062ce3ed5a712533921da03565982a1bc9784660433
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_03_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 3684 bytes
SHA-256: 8646370d0881a7516eab749f2717e1074bde2032f13e3fba15c78ae6faa3e19e

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