Malicious PDF — malware analysis report

Static analysis result for SHA-256 412894a074a0b508…

MALICIOUS

PDF

73.0 KB Created: 2020-12-28 08:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d181a89b265f7b92bd15e05185e56cb9 SHA-1: 7e8ede7461b4769c0d45ef0eff113d5dcbd13de0 SHA-256: 412894a074a0b508a11d2fc3e1d6f2f72cfc58d2187ebbac5705bdc29652a2ff
214 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 and routes users through malicious redirector infrastructure. 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
  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=eine+kleine+nachtmusik+sheet+music+alto+saxophone In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5fc744fbdedc9.pdfIn PDF document text
    • https://zujolifuwumew.weebly.com/uploads/1/3/4/7/134773321/0f142f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fb49bf898b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_5fb56042e3cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f8df207b067c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fcfae8038ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5fabc3b8e9671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd652bace8a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fccb4ef47dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8a70685d986.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/lthftup/wallpaper_ben_10_omniverse_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fb9f42f986db.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 5164 bytes
SHA-256: 3ba8dcda22b6570fe27210441f661c7538d85c364e69814949b6496f3e186608
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 12524 bytes
SHA-256: a1181e94c4cdb4cd6db8e02ff9c05b58e57b74c4ef71fdcc257b020cfa589b85

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