Malicious PDF — malware analysis report

Static analysis result for SHA-256 61adec1bb1187838…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 01:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a255d0bc9d1584b6b3af4e8ac907a376 SHA-1: a796bbb4a6ccb5053a1bb596c538e3c2d45832c9 SHA-256: 61adec1bb118783802dc0a6c655b37af859bbbf77b9693173e881a493a527a9f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to potentially harmful 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://druttle.ru/strik?utm_term=what+to+do+after+overeating+on+thanksgiving PDF link annotation
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/wibujoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fdf46ae86e8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_6000f40f1d29f.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/8403504.pdfIn PDF document text
    • https://fobamenowukar.weebly.com/uploads/1/3/4/4/134485242/ximegaminabotut.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/rumumufijuxab.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/rodiligarexo/zifenixemixibigesavupojol.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/lejexowidom.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/61569885552.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/structured_cabling_network.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/yearbook_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/search_engines_information_retrieval_in_practice_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/python_calculator_project.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/fenobinuzes.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/1125630255.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/24410706456.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/69087001788.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 5272 bytes
SHA-256: 953569c2109bd6807298e002959456ca82f1a6fcdb452df17d2dd79941d0cc4d
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10128 bytes
SHA-256: 2ac8576880da02c9a010a69a18b8573c481f463ae67d8d310da8aa300bda12a2

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