Malicious PDF — malware analysis report

Static analysis result for SHA-256 b639ab109cf0ef98…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 18:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 539787cfa35e5d7a690c829af00edda7 SHA-1: 3cc71b8b9242f30c2c030b64ace147a0bc816536 SHA-256: b639ab109cf0ef9860f70f9af0700cbe24253fd04667d0e158deee9d76f56f93
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains multiple external URIs, including one pointing to 'jumiwimov.ru', which is likely part of the lure to redirect the user to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous links suggests a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=angina+de+ludwig+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5fefe05559c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fe7aa382b19e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd337e411fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530171/normal_600696d8f0052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fd33d94b1f05.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/600176719368p6p5.pdfIn PDF document text
    • http://oneitshop.info/ellie_taylor_mash_reportnyxwq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_600ddd21b282d.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/autodesk_viewer_dwg_to.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/branches_of_government_project.pdfIn PDF document text
    • http://persequen.com/zoxugu7xbi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/bandit_s_nest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627a9370-38bd-4981-8e26-69d09cab3546/what_does_a_spiny_water_flea_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef26e02-3d11-4bda-b8df-87b6d723fd99/xopusaxuxebilorepow.pdfIn PDF document text
    • http://wofavum.myartsonline.com/suffixes_worksheets_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0ef5d0-af27-486f-9a6f-0ce1d3195754/exercicios_quimica_organica_nomenclatura_hidrocarbonetos_com_gabarito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd59507e-1666-41f0-898c-2d8e27ad5280/how_much_is_the_salary_of_marketing_manager_in_the_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22978c73-4900-43e9-8627-5e75dc8c01ec/fossil_q_explorist_navy_leather_gen_3_smartwatch_ftw4002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2ba4da-bd98-400a-83d2-e59380603f34/tejimelemudutokupo.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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 5016 bytes
SHA-256: 00ac1f272b6f1c0ca176426180fb6b82cabc0a198f7cc6bf9dc6ce346110deb0
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 12060 bytes
SHA-256: 67691947e70cd0cbc4177987c3e0a0695142fdeb4ccf4a6ad72175862317398d

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