Malicious PDF — malware analysis report

Static analysis result for SHA-256 8648b94d298e467a…

MALICIOUS

PDF

73.4 KB Created: 2021-02-19 00:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 24a539f14ce7b18de45e59f4848f095e SHA-1: 9bd3e61f0f3e4882ee4b36689b862ef46cb839aa SHA-256: 8648b94d298e467aa777266cab8174da9ee73b9159d7aee55ff8a156e69e936d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically pointing to a large number of outbound links. While no scripts were directly extracted, the nature of the link farm and the presence of external URIs suggest a potential for further malicious activity or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=hero+4+silver+sd+card+size PDF link annotation
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/xabirarotejiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6012281b8308e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601cf9e7f367f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_602b67b08d1aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd3cc0c0a62a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_6026d81825f9a.pdfIn PDF document text
    • https://zakosolegim.weebly.com/uploads/1/3/5/3/135337695/wirikejar-fekoxonovoso-fiwanoxapiw.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/46877210087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff2b9e3053dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402721/normal_60064ac9a0af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_60231483c0710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufizomofoduzin.rf.gd/rifewitem.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 5092 bytes
SHA-256: 32ad429df0d89dabd98ec28e18a150b13bff34062a7d5c3b034892e9cc7d3a98
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 11676 bytes
SHA-256: 19d414db7f228e31adc4cd16d8f08ea61785935f7155fa1bad0e9a6ff29f855c

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