Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac07ddd3bf552c…

MALICIOUS

PDF

74.4 KB Created: 2020-12-16 01:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a8ea4a87874253b01bb940e6aff01973 SHA-1: b5dbc2cec5b48adfc400a41b064ebc298318b4f4 SHA-256: b4ac07ddd3bf552c095effecdc86023478f2391c163718815497a81da825c856
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is likely intended to lead the user to a phishing page or a download for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?utm_term=relaxation+techniques+to+reduce+stress+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fc6f851a4c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5f8fb3c36c30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f9f1e95a5687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f87bb8c2e98a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fcc8a891d5a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fa4cb91b9db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_5fb044751e55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f9ca18c3e829.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/21b39b34-e819-4d3d-a84d-5002d465b518/54978880495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdce7eeb-6d6c-467d-893c-7012b23aa7b3/spotify_brand_identity_guidelines_pd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f7ecb3e0f5771470c97/1606377342554/fun_run_2_free_coins_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca5fe9e-e0f6-43e2-bdec-40aedfc4c541/ralomiwonolumozava.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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5444 bytes
SHA-256: 48d150ca35a1a7240d17b7551c4756ae3992f60346dcf6703203ce4cb766c616
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10932 bytes
SHA-256: dcf1f1b2e289a3b8b3a3ba97c0afa95f3a93b276adf516f73b13f0fc3fa881f2

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