Malicious PDF — malware analysis report

Static analysis result for SHA-256 5947d1556adf8982…

MALICIOUS

PDF

72.3 KB Created: 2021-02-28 19:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7a2c633757c29dbe9fa1251bcb70fe4e SHA-1: df39a776ab48c98c75fea37bb8914fd2752ae8d2 SHA-256: 5947d1556adf898224e5a0acb4982fd876dad34705f0012eae45bdfd854a9936
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://seumenha.ru/wix?keyword=thunder+vpn+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403271/normal_600b56ec6346d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fde699bd945b.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/nhigh5w/turret_defender_vrchat.pdfIn PDF document text
    • http://sale20.site/99381897855gbcg2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ffd693a3e66a.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/tebowupumem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_602d097fa1dfa.pdfIn PDF document text
    • http://priz24.site/gipedws71a.pdfIn PDF document text
    • http://gallery-shop.site/19909608405znfda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6013598ccaa42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fdea720d30f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5ffa8692b573f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_602ad12681720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5ff2cd63c148f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_6026a47b7b75a.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/gubuk_baponezuse_pinuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5ffa2b0de2ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_600309c71878d.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/boxivezevalomegi.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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 4788 bytes
SHA-256: f104993ca6f015df21852f1d6f19f581a86e2eacac723a22d93ea8259ff20de9
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 10196 bytes
SHA-256: ab9c6f1a8870d8ddb2a469b61b8548db5c6332a734cca36f2677e23646a6b4bc

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