Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84a3f8f083cdc0a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 07:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d38cc88bf713263165ff1040d413f41b SHA-1: 1faa0c0a539dc55a1e0372a78b9e2ca9b6e4da2d SHA-256: c84a3f8f083cdc0a6ef4e8b1c54bb82c5fe3178331905c4c8883d1f27f2dec34
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 hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Ielts introduction questions with answers', likely a lure to direct users to malicious sites.

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://druttle.ru/123?utm_term=ielts+introduction+questions+with+answers PDF link annotation
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/saduwulen_zenewizinivabaf_vilapinivajilak.pdfIn PDF document text
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/mikorerapofuvifaj.pdfIn PDF document text
    • http://sdek-24.cc/11659005987xa1qy.pdfIn PDF document text
    • http://changepass.online/54869240307cc7db.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/como_crear_un_archivo_de_contactos_csv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5ff211d48cfae.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/antonov_225_paper_model.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_603a12377aaf1.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/xoveduzu-rawodujazoba-liponujapozew-dukilivakeno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_6001796c13168.pdfIn PDF document text
    • https://xuduzaximebawu.weebly.com/uploads/1/3/5/3/135315026/9a1489a2d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6027744b01f8d.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/3486008.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/nofujupaxofosolanag.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/vagilowebimewifo.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/funifirofikol_mekikulobiduxon_kofabik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_dcd3bb751eed4b2f99aaaf4b774d444a.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_210b9ccaac1a49c5809c5ac08ed90408.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_1be10496ea554f8d8a6a23519c23a749.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_4d674f7845db49b5805b0f77075ed331.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_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 5180 bytes
SHA-256: a5e4b9d1b2c0fd37dd5a17a60d0c878068a6c27a9e9db0dea4a75c16fad08f5e
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 10540 bytes
SHA-256: aa678bd85a25e6c00775b5dca3d11541d84e911f08a72778361b187e30ede50b

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