Malicious PDF — malware analysis report

Static analysis result for SHA-256 5621e4e286631aef…

MALICIOUS

PDF

73.6 KB Created: 2020-12-26 18:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 218f420014f485d574def66c6e94e8d1 SHA-1: dfe6e397a90828efa58af31072556b3b36629f8f SHA-256: 5621e4e286631aef3b69ee2e9383e7e52b07d00f39c2998ed7f130c5dc4ca96f
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URL is the primary indicator of compromise, likely leading to a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?utm_term=make+it+stick+pdf+summary In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fc7795855c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f885176dc48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_5fa82e59e0d92.pdfIn PDF document text
    • https://cdn.sqhk.co/lamifiriluz/v3t0idQ/charm_city_kings_cast_from_baltimore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f89342a32ab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fca732531b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_5fcff740b2dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4161710a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5fd8e73cb9fdc.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/70474317-331e-4393-a82c-fadf7c1c4353/baldurs_gate_ee_keeper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2aeb4f5-d3a2-43ad-a79a-91a4ff242a37/560074827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f210a403-1d32-4df3-ba56-58f54807851f/order_of_operations_activity.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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 5440 bytes
SHA-256: 79958f7b75ce9fe48d75d187d8904536eb1846469be8fe573503e369f95b0ba4
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 10192 bytes
SHA-256: 6774a1ad27144fcff984b52585e4231824b17a188b8a47183ced7e700632d37b

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