Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9430015e8e1affe…

MALICIOUS

PDF

72.6 KB Created: 2020-12-26 17:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2694ef1d5dad740751433cc94244a576 SHA-1: d593673b37a4042dff42eb74184a36bee4b80296 SHA-256: b9430015e8e1affe9a078041ab20517d9b150011dd009b560a3f354ea8c390ff
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or SEO spam, with one prominent URL pointing to 'traffset.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a malicious intent to redirect users. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://traffset.ru/aws?utm_term=activity+indicator+xamarin+forms+android
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fd9d28a7809d.pdf
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fe535fb83425.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/xomati-finirofuris-fizeronuze.pdf
    • https://cdn.sqhk.co/kewudomavave/TfJjday/bomojakoxojat.pdf
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f8e63ee5bd8e.pdf
    • https://devaropig.weebly.com/uploads/1/3/4/6/134616199/nojesonatumogul.pdf
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f971cdb9beee.pdf
    • https://cdn.sqhk.co/xuvomuvugu/ifibjjC/80432656314.pdf
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5fabd044102ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1d39e4cd-feff-485b-a17b-0568a57d443d/mefewaburaz.pdf
    • https://uploads.strikinglycdn.com/files/771b36f0-210e-4e49-8444-0df0a90a575d/commanders_in_crisis_1_previewsworld.pdf
    • https://s3.amazonaws.com/pazifetanegapu/list_of_indian_airport_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f8.bin
71f0cfa3ca89ea0e3db56431b36dfef3304ca9164fc78ac43acaefcaddd29487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 5024 bytes
font_01_sfnt_off0000d5f5.bin
04d7ecb7dc330337f64cb0b9d3b9275360b52b5d1cfe40f217f1bcdc4ab6b9b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 11052 bytes
font_02_sfnt_off0000fbe0.bin
8c4ea0f9aeab5e9b0764083ebb5dde05a40bc909a0fe4bc872b490834e74f813		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 2944 bytes
font_03_sfnt_off00010716.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 4324 bytes

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