Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c1ed148cca4818…

MALICIOUS

PDF

64.2 KB Created: 2020-12-28 07:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fa55a64da5ef2f302a8eb78e3d0f6276 SHA-1: 188aeba9ae4954be0b6327d511d9715ea1c39e20 SHA-256: b7c1ed148cca4818d3c2a6933e94b88ff27a9de9a219b0012897b09708c7d4a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDFs with numeric slugs, suggesting a link farm for SEO manipulation. One primary URL, 'https://traffnew.ru/strik?utm_term=ludo+classic+apk', is identified as a potential lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffnew.ru/strik?utm_term=ludo+classic+apk PDF link annotation
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/5838383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fdc27b4bb4e7.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/152023.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/tumufemojuwuz-viwepari-kufusogafupavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f896d602b8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5fdd85681ea2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5faa2198a9fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fc32c9d7731e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f88a9e84eb5e.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/gjUiaAQ/rotokojelixeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fbacdc5b2503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5274dffd-af52-484e-bc1e-568711b32429/6177364521.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_off0000c059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC059 4976 bytes
SHA-256: 5ead81a712af39bfa3bafdcd2dbbf8139d3517a1cf9283ab7146dca1f25126d8
font_01_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 10212 bytes
SHA-256: 6428c3595e5601813a36997ac81e5ad246710d6c62f2294cf014d55f8016a3e5

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