Malicious PDF — malware analysis report

Static analysis result for SHA-256 630e20da23b76abe…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 08:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 420211b4aab52004b38bc9fd2226eb3e SHA-1: 7add41e82455cb6766354ef7732d605f52935ac8 SHA-256: 630e20da23b76abec2a462239aa1d1206ec84aef1ab4f79c64e27f128ce20c4c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9583

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=aula+internacional+1+cuaderno+de+ejercicios+pdf
    • https://cdn-cms.f-static.net/uploads/4471275/normal_5fe6e94f7aa63.pdf
    • http://natosabi.mygamesonline.org/67115494049.pdf
    • http://sutobep.getenjoyment.net/69455398870.pdf
    • http://rawitotizoxuk.scienceontheweb.net/xetaja.pdf
    • https://cdn-cms.f-static.net/uploads/4501046/normal_601f24286d687.pdf
    • https://cdn-cms.f-static.net/uploads/4489846/normal_6028728c6e85d.pdf
    • https://cdn-cms.f-static.net/uploads/4417139/normal_5fd85583b20ae.pdf
    • http://expressvpn.store/76820731503ci34.pdf
    • http://meblik.su/kalorodudakosepajonopepywkfj.pdf
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd1638f271a2.pdf
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff2b044520a6.pdf
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5fc5b61c91a39.pdf
    • http://shtampshop.ru/how_to_work_a_brookstone_projectors5q6p.pdf
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6051beb50cd7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_7078dcaf406a4dbc8120ce3cd68589f7.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_8138f6c3784e4d75884c0eb00ef042c5.pdf?index=true
    • http://rojanesifilagu.myartsonline.com/suweled.pdf
    • http://moduvodaw.epizy.com/24604093945.pdf
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_8aa00120bbd6438c95ffe80fafc3c07d.pdf?index=true
    • http://fifozeripomok.rf.gd/how_to_put_a_book_title_in_a_paper.pdf
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_452c0865babf444a84b73832904c360a.pdf?index=true
    • http://kirigawegugava.epizy.com/nenudazilemejafawabo.pdf
    • http://fotolen.epizy.com/late_payments_on_credit_report.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f233.bin
f9c95dde568fe4bb23dc4120c7e76cde33025964cf45d2bf1a7f6f398bb6b649		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5268 bytes
font_01_sfnt_off0001043a.bin
e03edf305c63adf3a48ddc27e2e5753af9592b87f0335db995176f65c8b84744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 12372 bytes

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