Malicious PDF — malware analysis report

Static analysis result for SHA-256 428ea995ea3f29c2…

MALICIOUS

PDF

67.5 KB Created: 2021-02-16 08:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2ab480ed3aaca75e01fb39dec1eec4ba SHA-1: 7ac71436a9136da95adf215e6fc49a048645fe24 SHA-256: 428ea995ea3f29c23f464d8557f9a618c8ca46f3462b64da0615c69a62120bbb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=yamaha+dgx+660+used+for+sale PDF link annotation
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/51a6dead1.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/7670147.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/jixulizugenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_602621a9aea32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5fcda18ff3f4f.pdfIn PDF document text
    • http://tekeriset.iblogger.org/any_video_cutter_free_filehippo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fee1bcf777a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_602069553d0ef.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/xetejim.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/joxap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff1892d3c77d.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/vutanifedawaga.pdfIn PDF document text
    • http://summer-italy.fun/how_to_write_condensed_orbital_notationshgs8.pdfIn PDF document text
    • http://buytoday.cc/wordly_wise_book_7_lesson_12_answer_keycvrmg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_6026576b3f7e4.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/dugomusovegurutadul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387811/normal_6000b5052b52a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvebex.rf.gd/bokibamur.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_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 5648 bytes
SHA-256: edc2388a885874ba7000233eaf0c99855f6b6bb4027b08ebe462936f0e094303
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 9808 bytes
SHA-256: 182563ccb0fd8a40e4a78fbe6baaba2c897ab0d60c7eea574ac9c3ecd17180aa

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