Malicious PDF — malware analysis report

Static analysis result for SHA-256 256bb6deb26e0139…

MALICIOUS

PDF

74.1 KB Created: 2021-03-31 12:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 55d08bc0d12cf67232a271632dc38bbe SHA-1: 5ca9afb10033e96332b5850c12273f41e7a22b8f SHA-256: 256bb6deb26e0139e1d1acb2f69855a508b6ed7b83ac99711422cb1c17b45a08
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=california+fish+grill+menu+pdf PDF link annotation
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/dusedazekulaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fcf4a23012bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_60376b50621b9.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/tipos_de_sistema_operativo_y_sus_caracteristicasa9lfg.pdfIn PDF document text
    • http://my-favshopg.online/libertango_accordion_sheet_music6dndh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fdb0b3775507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_60611aae5d877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5febb7ee1241c.pdfIn PDF document text
    • https://vuguboxu.weebly.com/uploads/1/3/4/6/134672273/patibuwaref_rizometat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_602a02751bb48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6012bf71f3bc8.pdfIn PDF document text
    • http://kittyplay.online/polk_audio_dxi_12_inch_subwooferjqdrq.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/ruwutufe-jowovapotu-bazileremepumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_5fcdaebbdb588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widuxade/65890139097.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/10452525699.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/vb_knowledge_matters_insurance_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/fotenivopiwikus.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/a_link_to_the_past_map_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/morning_stretch_routine_to_increase_flexibility.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/term_paper_writing_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/sivopefinosidusuroru.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 5360 bytes
SHA-256: f73f2a1f73476f2a884083786e67eaea1bbfc2fcf339a904086181926a69b7f1
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 12660 bytes
SHA-256: 0cf8688ea672bdeb63d436ef2a6d5adb346195bb7bd9a046d981da317d8ab8ed

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