Malicious PDF — malware analysis report

Static analysis result for SHA-256 4013f4b95cfb5e16…

MALICIOUS

PDF

67.9 KB Created: 2021-03-18 00:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 25ab4752ba8a5c8c44cc07a05ed67daf SHA-1: 229bc37ad2d029d58f6d2587f27ece232ab65b67 SHA-256: 4013f4b95cfb5e1654cca6b12ddcac0a4d2fab17c5181dcdf874413fa70c227b
156 Risk Score

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 numerous external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. The document body, though partially corrupted, contains metadata related to PDF creation tools, which is often used to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+add+pdf+printer+on+windows+7 PDF link annotation
    • http://regse.website/509589738084o2kt.pdfIn PDF document text
    • http://radanews.site/nisif6gj5l.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/doradopax-zetir-pimukov-kugerid.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/387472.pdfIn PDF document text
    • http://tertov.xyz/87863656932eo5tj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_600a94db3a516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_600301fc9f39b.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/5762344.pdfIn PDF document text
    • http://sodaapp.pro/gopunazurukataroravusoradhd4u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_6048be21eb453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fee1d906e5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_601ef5785d27c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizup/lajiz.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/contemplate_on_or_over.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_6bfd35b3e9854c579c2bb10b29172edf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/vidmate_mp4_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/clothing_manufacturer_company_profile.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_149ccaf296a141469de585a9eaa03b45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/zigazuz.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_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 5136 bytes
SHA-256: 918245be9c3b22ded163f6cef161ee936d99de2587218a2aefa28fd3523496d6
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10224 bytes
SHA-256: 6eea2749783d3874767c545fae842f4e5f47327288ba6025d00ba76b095e8bc9

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