Malicious PDF — malware analysis report

Static analysis result for SHA-256 278ecb4b1d052098…

MALICIOUS

PDF

81.2 KB Created: 2021-05-27 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5848d5808d593c933e41e7db98e2a33f SHA-1: 53902f52402fe868280a9bf6f482527d37447d2d SHA-256: 278ecb4b1d052098b517385eae4a92e361141b4c42704d8f3c01858978b7cf33
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/123?utm_term=bed+bath+and+table+linen+sheet+set PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462376/normal_60066038e2ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_60141ed28ef6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_6052d2cb0f7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_60568826b0b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5fe7415dbebe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_606957d8acbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_6042d8a4a6361.pdfIn PDF document text
    • https://fuburufogukedez.weebly.com/uploads/1/3/0/7/130776130/rufikutetoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_6034dc0b65807.pdfIn PDF document text
    • https://nepajomawowezuw.weebly.com/uploads/1/3/4/4/134462508/4ee227aaa78.pdfIn PDF document text
    • https://simovisebosa.weebly.com/uploads/1/3/4/6/134649932/kobavobeza-mujumu-vogowunorefu-pikiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_6017b4c64c2c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5fda3966e5aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453551/normal_6060e6013abb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_600e371229440.pdfIn PDF document text
    • https://migerele.weebly.com/uploads/1/3/1/4/131453560/7eca6e716a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_6037e26a7e1f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380079/normal_5fe5c4490ec60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 5008 bytes
SHA-256: 84a570b75e41089161edaaebdf66f29c27a8250cc81a9eb08e0c971caa4a956d
font_01_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 11296 bytes
SHA-256: 92ccbfeecab3ef2f4e20ce1005342412ccb0a20fd1df726e118c119802d7aaf2

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