Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c01d3e5ff067b39…

MALICIOUS

PDF

76.2 KB Created: 2020-11-18 06:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 00db1f781ae1218b98114784b62a5f1d SHA-1: 14c24953071e93fd5dbad27f1d7c25f3e944adce SHA-256: 5c01d3e5ff067b39142cb6cf8437c42c754128af2219741df525845f1c83a772
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://trafftec.ru/strik?utm_term=ancient+near+eastern+texts PDF link annotation
    • https://kumuxabe.weebly.com/uploads/1/3/4/6/134670594/fexumeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5fa3b52de6b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_5fb2b12b904c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f95cc491f4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_5f9ef1c5a837b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f9153b5123d2.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/fevovadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5f8d626cabc80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5fab552d38bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5f9c4472cd414.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/levumoduf/manual_geografie_clasa_5_cd_press.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/desuzabekaworigobixoku.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/44391663788.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/advanced_download_manager_apk_android.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_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 4816 bytes
SHA-256: 1256af1781187ab0c4b581d49c5cebbd40a2c949b2cb4b854e2faec2101fef73
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 13056 bytes
SHA-256: 310e9e977d7ed7e43d3048ff64aa1e3f7f8bc4871b331546a2a4ac50f1f9c43f

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