Malicious PDF — malware analysis report

Static analysis result for SHA-256 b416dfa45125b989…

MALICIOUS

PDF

72.5 KB Created: 2020-12-31 11:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 62586cead6817dbe801370852ba63995 SHA-1: dc9d28ac665aba7736a48775f15c83e31f1e48fb SHA-256: b416dfa45125b9894e1aaf291f8fff338d67fec848c27f45ef8aea2070752f61
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=lebara+mobile+data+settings+spain In PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/pobexavebop-tisex.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/f9c04f92d5c8bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8cf084ac928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5fdc515e50987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5fadac0aca064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5fd8944b01746.pdfIn PDF document text
    • https://xekotoruwogobib.weebly.com/uploads/1/3/1/6/131606212/bagoxixan.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/2siUMha/50696014622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fd0d55a12365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5fb2ca07cac3d.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/3084f7cc-ef2f-4056-ba28-e8b2e6c813c5/pizebinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcb2d3b-17d4-40e9-a122-d99fbc14e62c/libro_de_quimica_2_bgu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4b3527-7e47-46d9-a6f2-a9687b5de686/davinukitunevotuwewan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ec90ac-518e-471e-b8db-c884f2853453/paledaxolatorum.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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 5360 bytes
SHA-256: 81d22ed10c4ec44e437f502dac566f95e20274d9152c1f7fbbbc09b2bd12ca85
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 11448 bytes
SHA-256: 150820f70e3e14768a0a6af46e3e8f7700b626aaa9c1de7d9b5eb7b422ddb16e

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