Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0afd391a38aef0…

MALICIOUS

PDF

83.4 KB Created: 2021-03-09 03:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a86087bf9957f0e6da5f66957931f90b SHA-1: 712f0d04dfa4e50fa746fda9de86e0527b420755 SHA-256: ae0afd391a38aef04c16399aa868255dc67d41cfcb1bf1a15da4c3816a4c7a7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The primary malicious URL identified is https://mezovuduw.ru/123, which is likely used for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/123?utm_term=tecnolog%25C3%25ADa+de+la+informaci%25C3%25B3n+definicion+informatica PDF link annotation
    • https://tojemevu.weebly.com/uploads/1/3/1/3/131384016/5329484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_603d572dc1c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_603e7f993b62d.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/8888851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5ff66491ad142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_5ff1728a7873d.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
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_86b83d9f97bb428cb75a6f3ac9fe19fd.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_df8137c8414a4a7f8ea12ab317bca4f7.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_e0479b81dbd74ce49a5c76f72d904c6e.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_9f717a01ab8f413695b11dbb7c29d89e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/ias_exam_date_sheet_2020.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_e4287dead1c44e91982d7bad1775628c.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_2ee36761adbf41a489a7f3470ca6bbec.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_66f09dcfb04546e6a85c7074b869b080.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/1652976883.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_122ce63b0aec4544a0fffd861f5848bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/54524450991.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_c86b412ca8ae40fab4e3aa7b5e6cafe6.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_18f58bdc01b8437ca5a1bc2933b5510c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/bigo_live_pc_free_windows_10.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_e5527ff24b9643c4801da71c7a9a655c.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_93172473638a40369e76a2935e89147f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/mukuwilofuwubuwikari.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 5092 bytes
SHA-256: bbd0a64416071a69ed2f79c73bb55f451fad94d4f28bac8e319559e9619cbc52
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 11352 bytes
SHA-256: 1bf19d0432539e7c292aaacbdd580869eaff8523f187a5d0a74444008713f80a
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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