Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20650a2f0bf3775…

MALICIOUS

PDF

68.9 KB Created: 2020-11-20 09:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b882721715682948b47e54a69ab94c4c SHA-1: bb70e053b8949e6676fb042a6d879adfadd2ee98 SHA-256: c20650a2f0bf3775679e7e3579ece67a3c0102efb2c2d85d093dde5dd21575fc
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 embedded URL `https://traffmen.ru/123?utm_term=how+to+finish+dissertation` is directly associated with malicious redirector infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

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://traffmen.ru/123?utm_term=how+to+finish+dissertation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fb75001d8dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f9e0b415e07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8ac63eb688d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5faf2a52ab5fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f92bce30822b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fad750699fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5fb4cc4fb3a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f945e35a16ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_5fadbc0cde479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fa96f5ed1e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fa8361dd9e27.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/362a88a8-be4d-497c-b7a1-5eb1f8bb37e4/division_of_fractions_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b180569-f211-4242-821e-9b48ade85114/vapabef.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/meterebezox.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/pikitifemazenufipatorijo.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 5016 bytes
SHA-256: 431d5bcfc530a2fbe981615ad95f2821020cffe99dbe37abd8d12a443b8af1f8
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10312 bytes
SHA-256: b645f862873b530927541fc2bea271da7af65ea4f45b7037c6b6e9d73a2a89dc

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