Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbc89f7df1adb99…

MALICIOUS

PDF

75.7 KB Created: 2020-11-30 10:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0160884d91724d9342ecb44175776b01 SHA-1: 07940ea339ad42289bfcac371395fe4a2e0dc2b0 SHA-256: cdbc89f7df1adb99b04ee8621a854815374f5d9f68e29da236dfee1688e87e33
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being 'https://trafffe.ru/strik?utm_term=animal+games+online+unblocked'. The document body, though heavily obfuscated, contains text related to 'Animal games online unblocked' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious links. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/strik?utm_term=animal+games+online+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fa730721da6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fc4865bb4848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_5fc0538cb4360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f9d5af05857e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_5fad1125e153a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_5fb2af8b29c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8dcca4c5bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86ff7e1f0e6.pdfIn PDF document text
    • https://zuzimarubafa.weebly.com/uploads/1/3/4/7/134712841/1304036.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0bef4084698658e5d6cda/t/5fc223844e98326c0258f30d/1606558601367/company-issued_engineering_scroll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322ff936-9222-4932-bb23-b1e4ddc1fb59/38166253139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3673b3c4-7960-41c9-b77a-247fd7799990/94758813990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822dfe9d-a78e-4ee7-85b3-813c89a8d008/nuwozefatiwofurexalipe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd27764f21657362f41879/1606231929220/shark_navigator_nv22s.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 5156 bytes
SHA-256: 5de6b17bb4eac0b1acd1e43fb90be9de451bcd80a570973b6d031c9df14947a7
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 10124 bytes
SHA-256: cfb99329f3ee01dc8f4e1d38dd52fc6236ea75543c2ccb0c44eef23856513f55
font_02_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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