Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5e7415d70fbee9…

MALICIOUS

PDF

71.2 KB Created: 2020-11-14 19:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8073e83377c374746297e77697ce7978 SHA-1: d9fe8b97c6cfe7b69b949d8f755516d58adaf306 SHA-256: fa5e7415d70fbee98858b2296d4de25b68432fc4000bcaa9305038449bcc7a3e
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=speech+and+language+processing+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408319/normal_5faebe5e4655b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_5fa8667af14d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471114/normal_5fa8b3ae90853.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/5a359d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5fa916f23151f.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/vefewapavodudulipek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f980350b22aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5f9ed6d9086c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f8e48dae5ea1.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://s3.amazonaws.com/jebokizez/42490349634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcf893c-b0c9-444f-a3be-7df1d9158543/folugawonarusibebideza.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/wow_monk_leveling_guide.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_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 5324 bytes
SHA-256: d1b14a696131b9c9536e53f0b6e20720290b5fc843c1b81b41d0bb1a1f4773f5
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 11148 bytes
SHA-256: f0cbe9b4eab1971855e3b6333553b66ad92844259de8cfa72426133ab8263320
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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