Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fba35871b61b9f6…

MALICIOUS

PDF

79.7 KB Created: 2020-11-14 15:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f02c2c48101efe132121ba5b9a5e6e SHA-1: 193c2b6c70bf0eb0dff356547ea3d799c3f1275c SHA-256: 5fba35871b61b9f6deb0a0e7944b88736d53a6e8b02ca78abccc9a7a47054691
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results. One prominent URL, 'https://trafffe.ru/123?utm_term=change+cd+key+counter+strike+1.6', indicates a lure related to game keys. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=change+cd+key+counter+strike+1.6
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f88a8e5576a9.pdf
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f92da4cd1ffe.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f8fd92193974.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/zejujurozutuzepu.pdf
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/kutadaloxari.pdf
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/4095577.pdf
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f8b740b8273a.pdf
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/wewetuda.pdf
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fada5bf1effb.pdf
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fa63514091bc.pdf
    • https://sexutenevasasi.weebly.com/uploads/1/3/4/3/134306733/483874.pdf
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8d68456290d.pdf
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f9d39d090b7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c146b361-9984-48b2-9759-58d31c9dce1a/vepakumupobada.pdf
    • https://uploads.strikinglycdn.com/files/c2fdd895-641c-4beb-8b7b-ecd8ab979531/berkeley_ymca_zoom_classes.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bb.bin
51b41c54215dcf80752bb72db8b13ac1b795d774fd6fe7e0d61f68ac262fc635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 5476 bytes
font_01_sfnt_off0000f362.bin
892432c2168c6eaef35a1f49339645cb879b63c9b21be71a7e6e1db3b7f73903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 11856 bytes
font_02_sfnt_off00011b8d.bin
e38c1bf64764582757dc05d17ab2e5b5758b22ee08700b9db35351ba74d249e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16332 bytes

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