Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9e557d77fb02d4…

MALICIOUS

PDF

73.6 KB Created: 2021-05-28 07:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e577c1dd4781b15a7d3c8f0f0a38a0 SHA-1: 1ceaf71cbdaec59611edfee74c0ea620d5a45935 SHA-256: 7c9e557d77fb02d454f35c90c13e09c61a1bc395d9da29c1d29cd3dc34264f0e
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse tactic. One such link, https://botokaw.ru/strik?utm_term=total+video+converter+license+key+free+download, indicates a lure for free software licenses. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=total+video+converter+license+key+free+download
    • https://gaxiworet.weebly.com/uploads/1/3/1/4/131408942/nolubonuxelo_xiwetibezatola_pinarubi.pdf
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fdacc5a50637.pdf
    • https://cdn-cms.f-static.net/uploads/4469849/normal_600dd7cd9ae62.pdf
    • https://cdn-cms.f-static.net/uploads/4476601/normal_601958b55299f.pdf
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/zumatojafanali.pdf
    • https://buvesedivuros.weebly.com/uploads/1/3/5/3/135398108/90f13.pdf
    • https://cdn-cms.f-static.net/uploads/4456420/normal_5fe802f61dc87.pdf
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5fcb39ab266f8.pdf
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/lilopejutumuxav-befobapibekura-vatavo-wamoz.pdf
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/1165508.pdf
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/7226991.pdf
    • https://static.s123-cdn-static.com/uploads/4487927/normal_600657f61c8e9.pdf
    • https://xojenupikubola.weebly.com/uploads/1/3/4/7/134747345/xovipajepa.pdf
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5ffec0780836e.pdf
    • https://jewepixixa.weebly.com/uploads/1/3/0/8/130814248/2026302.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/4587217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1efd0e61-9a22-4907-b6fd-bac895c2344d/monster_valentine_sayings.pdf
    • https://uploads.strikinglycdn.com/files/9bab1065-aad8-49c8-97cc-04a5dc1c6922/should_seasons_be_capitalised.pdf
    • https://uploads.strikinglycdn.com/files/e7398028-6824-41dc-aeee-609eca7398bb/timex_1440_wr50m_sports_watch.pdf
    • https://uploads.strikinglycdn.com/files/25cc949b-2f4e-4184-9e78-f15a3fa72556/lokutosusebedejiroro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e321.bin
e9b9f70b2392ac2d6a4d809d6a1f2b519453db63cf0e4f1e8746d10facd64d03
pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 5280 bytes
font_01_sfnt_off0000f546.bin
ab457740299206d25ca2a0c4776e8d01d42aaffafeb50cee1f68c4ebdbe742e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 10476 bytes