Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7481d613874f4d0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-06 11:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c75296e9130679871bd5666d7047f8e7 SHA-1: 0e3a95d46edfff85eab771f43e314a9a687e15dc SHA-256: a7481d613874f4d0cf126a740b5eaa6a06a3d3f064230cc75783c0ed924338a8
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. It contains numerous embedded URLs, including one pointing to 'mezovuduw.ru' which is associated with a study bible download lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely for SEO manipulation or phishing. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=study+bible+for+pc+free+download PDF link annotation
    • https://cdn.sqhk.co/fovipobex/SibkDgf/vijevenowekekad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_603808b2cd53e.pdfIn PDF document text
    • https://tapoduxumusuna.weebly.com/uploads/1/3/4/7/134733142/nonanetekavifaninope.pdfIn PDF document text
    • http://porn77.design/40082229176eiqsd.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/jCxM8Sa/gestion_d_une_entreprise_de_la_construction_asp.pdfIn PDF document text
    • http://livecopyrightverification.com/97344657974qfgz1.pdfIn PDF document text
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/3532107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5feecdf208f18.pdfIn PDF document text
    • https://cdn.sqhk.co/bumajanivosi/jhhmhj3/z_nation_murphy_x_reader_tumblr.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/EtIjd0f/tom_and_jerry_characters_name.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/W9gfbyJ/hd_game_screen_recorder_no_root_pro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_7dfda2e450ee4b7cbad0329db652df84.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_65a594c22a1a4d1daed4a25162b43332.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9916305e-dcb8-4308-8c19-514db5faffc6/el_amante_japones_casa_del_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b86cd77-3c91-4cb2-8627-c961558d2f04/menimimefupufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af60815a-eab6-4238-ae7c-3d733d6a44da/96862970002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39c4d0b-a3ac-4591-938b-f202beb6c50f/verbal_reasoning_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48dcad5-2f03-495b-90c2-ab1b0effa061/33891831557.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_1b3d7d3632144836838890a75a8b160a.pdf?index=trueIn 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_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 5408 bytes
SHA-256: 9a10a64bd56ee484596f8653eba8430c883a0b45cd9f1e3f2da592ea46da4017
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 10112 bytes
SHA-256: 382ff477548960520abc0e0772839f59971511ffe808d0e7713161fd75ea6629

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