Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1274ecfeaa27ba…

MALICIOUS

PDF

75.2 KB Created: 2021-03-29 19:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f7602eed61f9e078c3a003c60eaf06db SHA-1: c02187f97f64050f9c7406ebe4dfe38e5165eb5b SHA-256: ac1274ecfeaa27ba8dbd56c533efbda6567b82f91187418f7fcc80c1928ab3ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=biostatistics+question+bank+pdf PDF link annotation
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/efe3e026a9f8b3.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/tukuwepoje_winuluxu.pdfIn PDF document text
    • https://neritakewu.weebly.com/uploads/1/3/1/8/131856632/devewumef.pdfIn PDF document text
    • https://pederojelukeb.weebly.com/uploads/1/3/4/8/134859697/27eda02b50085a.pdfIn PDF document text
    • https://figabufireso.weebly.com/uploads/1/3/4/4/134435363/4028260.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/4de4b.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/6c180a73c97.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/1669514.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/fighter_diet_reviews.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/27fe891bcf5.pdfIn PDF document text
    • https://banijeweziwi.weebly.com/uploads/1/3/4/8/134873891/virow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e46b8a9-a026-47ce-9c10-45dcf7f38086/63410887447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee43c60-284f-493a-b3a0-a164c7f22f29/xoforetutosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5794660c-f5fc-4dd5-91d9-26356df2e234/warriors_don_t_cry_full_book_free.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/munugirokorevebagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f203f6-53a2-4970-9129-239613f312bf/pewulovivixakeguloleze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd8f206-3e48-4aad-980f-25acfab1f414/koxetatopakutiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e56d9a-73ff-42ea-b12b-4456c18d1da0/juegos_para_aprender_verbos_en_ingles_para_nios.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_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 5400 bytes
SHA-256: e6264d327626bd41ef6bd45e277fe9b99ac6a1de379b0ba1d18ab49d624a6e99
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 10868 bytes
SHA-256: f38adbf84c70b6314f3b91f232eb0cbadc4c8c066e719a725fdab2058a930b66

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