Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c681957b17b4e67…

MALICIOUS

PDF

113.2 KB Created: 2021-01-15 20:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 64bc5f45542dae8cb4aa927abba2fe14 SHA-1: d186f40b2f3824d373d62ce8da395a6fd25d1f9a SHA-256: 4c681957b17b4e671479a67011fabfc6b5af54af4f2a7be79b7b78a33b261113
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to 'Blade and Soul gear guide 2020', directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffset.ru/123?utm_term=blade+and+soul+gear+guide+2020 PDF link annotation
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/6676621.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/petakewodefomevep.pdfIn PDF document text
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/gabuse-mojofajen-nanutugorima-fuwubamoreb.pdfIn PDF document text
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/968d71418fe.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/9042127.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/68955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5fdc3933b9730.pdfIn PDF document text
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/kimedoxorenekupivix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5ff9c13c886e7.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/a3c2cde50af4f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_5fc21bd2330c3.pdfIn PDF document text
    • https://pofubelepegeva.weebly.com/uploads/1/3/0/7/130776421/pefowajefogaxilijere.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/somulixum.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/nijifefititorebaseva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753C 5316 bytes
SHA-256: 87c4704bbdf59e9dae6ca389c794c32f162530cb90de2b47c4e92f23b4df2b33
font_01_sfnt_off0001875f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1875F 15944 bytes
SHA-256: 793a7e8d221d0c02c09b30c313d829a15adac9765f050fa71e2a2400b9905163

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