Malicious PDF — malware analysis report

Static analysis result for SHA-256 e399cf0bc49c1cbf…

MALICIOUS

PDF

71.3 KB Created: 2021-01-05 04:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d532a2a55fc789a48a7aa697c8ee5015 SHA-1: 2dae34f3313d2ec88649563826b2bec0291d2554 SHA-256: e399cf0bc49c1cbf1f87c3deb93251ec04ccba7dd484811d521f6368243cdb2b
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 embedded content, though heavily obfuscated, suggests an attempt to lure users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=annadata+bengali+movie+hd+video+song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_5fe6128772738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f8fbff2ea91e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fe83b08424cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5fe14f1c3c00b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_5faf4d8d3b772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fd1725cc9758.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/djfiggd/stickman_dismounting_2._2_mod.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/dd089add-ae8a-4681-85e1-415abc1fb1f3/bovijifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d542117-fbbb-4ff5-b405-8a0eb120a62f/16761728136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedfaa8f-41b2-43ce-a78e-c67b9dc4ddd4/holy_tablets_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642dfa41-bccf-42c9-b58c-7ed9b0f2acad/secondary_solutions_romeo_and_juliet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd87094-4865-45e7-97fd-30af75c54ebc/educated_a_memoir_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e16d91-43bf-436c-8cdb-afd40f95ac41/3476705075.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 5332 bytes
SHA-256: 253fb2910d2b11b84c40715b6a80af33cd2c8904d5798f313a3f0d809da80d2a
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10996 bytes
SHA-256: c358838c89342fe6ae33b12876a0d084ea20b05e84240224a8f7acbca9c6ce2b

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