Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4b04f882f9dc2b…

MALICIOUS

PDF

74.4 KB Created: 2020-12-15 17:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7d1d02633f6c712c7f5a67edf6f0bb6a SHA-1: 921290c756632eb26c54734cd265dacd1139f50d SHA-256: eb4b04f882f9dc2b673676aeb48301d47b7e80128ee450c08063036721d23004
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 critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/123?utm_term=hands+up+stands+up'. This, combined with ML and ClamAV detections, strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of embedded URLs further supports the phishing or malware distribution vector.

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://gettraff.ru/123?utm_term=hands+up+stands+up In PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/810fc66b01cb1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f92ebbec048d.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/823c63b5eb81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8cc85e547c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5fa84aeb6e313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f9be14e741ed.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/1307222.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/14358830-bd62-44b8-a7b0-7488e14cf884/jefixisosinavexukugut.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e8cb2bbd74065813b48b/t/5fc390aa6457125654aa06a1/1606652075541/43914583091.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc591165e8e827d42ad8ebf/t/5fd0583ec0a29916a568fd8b/1607489602415/word_page_number_link_to_previous.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56d23ff13940aa25df82f/t/5fc6c46c7995075abdcd5b84/1606861933345/doordash_ipo_2020.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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 4788 bytes
SHA-256: c3666ca26eb84b200ec3abf5ecdd0d14d8de7f757192acd514de874421d7a9c1
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 10820 bytes
SHA-256: 56210788ac12a30a9f755bf1b3d80f3827f0c95b8f6178798a686335c80409df

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