Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad33ce0cd03326b3…

MALICIOUS

PDF

70.5 KB Created: 2021-02-06 23:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eaa1237b171e0aec589bc0fddabc992c SHA-1: 43820493b55ee0831e2e672051f04106005904ad SHA-256: ad33ce0cd03326b35406f07dcf9c874d508d3c62e0000cbb6ebf528d86992738
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, indicating a potential link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to direct users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://jacksth.ru/123?utm_term=zx6r+manual+2009 PDF link annotation
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/kubafarutajitu_zufoj.pdfIn PDF document text
    • https://xabejelowubi.weebly.com/uploads/1/3/2/6/132695530/b5027c72f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_6001d971133ad.pdfIn PDF document text
    • https://wuzijitegufizu.weebly.com/uploads/1/3/5/3/135320378/8453033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370280/normal_5fe5a76d163ec.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/xunozakuzugid-fapemebopegom.pdfIn PDF document text
    • https://zolaverapudo.weebly.com/uploads/1/3/0/8/130874102/naxike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5fd6d1179d958.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/2d73c.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/7463386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410018/normal_5fec1bd166115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff168014aee8.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/rogazigiwoxufob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tilixufevoj.epizy.com/anaconda_ubuntu_16.pdfIn PDF document text
    • http://zanebinelit.rf.gd/25078826933.pdfIn PDF document text
    • http://mivetafo.epizy.com/momikifobuvovusoruv.pdfIn PDF document text
    • http://bevonox.epizy.com/le_andria_johnson_better_days_sheet_music.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_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 5260 bytes
SHA-256: 59dcee4c2eb088ddf818e0c40a8c7db427392cb6266ef4ac117aacd038e15ff2
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 13860 bytes
SHA-256: 270331134f706811cad1b6e8b2a3c8f4776e158b5314301ee46c063a535c8138

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