Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca25254e80f5e06…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 13:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: efc7f7e948cc13bcfe3d40b905e04985 SHA-1: bf2f8a5353f6375d84a65927dc205500e5531ea7 SHA-256: bca25254e80f5e061e5a869a393937a5b2561c16a2876be69d5e537f10e031e6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection scheme. The presence of a critical heuristic for PDF SEO link farm and ClamAV detection as Pdf.Phishing.Trojan indicates a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'Android streaming apps like netflix', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=android+streaming+apps+like+netflix PDF link annotation
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/2729410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5fa0b5f5469b4.pdfIn PDF document text
    • https://rebolaje.weebly.com/uploads/1/3/4/6/134696551/dozamigeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f9712c276989.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/f7663157a.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/xumatubukuwod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fb28f9ac826b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5fa36488d5341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fb481706f7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5f9ea751a9150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f962d2c51852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddc3817-fb45-4e48-8bac-433c7ce76a5c/sixokugigukivi.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_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 5480 bytes
SHA-256: 21f9e5031c587e35496e9cbae18cabf5ffa44db01d01dfe6ce1a746697c7e48d
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 10468 bytes
SHA-256: d00e938ea45b4c7be6bc1fb3380ceca49059a07c323c2164ba046d65aac7a87c

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