Malicious PDF — malware analysis report

Static analysis result for SHA-256 10aafd2a9d174a63…

MALICIOUS

PDF

71.1 KB Created: 2021-06-09 18:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 88892094b202dbedb4e72e17d62f8540 SHA-1: 67878e184a18dcec979369e6ef79de8499d546eb SHA-256: 10aafd2a9d174a63a3e4179d643f1e7655e237db10f08104914d18904c786a1f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://catamma.ru/pbw?utm_term=exercises+simple+present PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486778/normal_604824391b2a8.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/xuxubogexuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5feb346394377.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/4893230.pdfIn PDF document text
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/6bba628f5f3b0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_6063993427aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_60222becd7949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601de86e4e6fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_6067582213a59.pdfIn PDF document text
    • https://lexaxaverewazud.weebly.com/uploads/1/3/1/3/131381910/242f80d28f8.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/3ec826ed-b44e-47af-8969-7f6677d05654/goduponewekiwizopulobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6e3283-0ceb-4a57-b682-ebec3d2ac1b6/2709632046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9834bde-628d-40d5-a495-14df18e2d0a9/74300922047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980652a1-d2a0-46b4-b155-b54b1361659a/awards_ceremony_program_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e3f4e7-f5ee-4260-8550-86d91f6bcee6/sosujofu.pdfIn PDF document text
    • http://kimiwodevus.pbworks.com/f/16141112482.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144480723/notunupinugezekirenawowo.pdfIn PDF document text
    • http://ditidema.pbworks.com/f/7170939668.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144476226/pulifeda.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 4892 bytes
SHA-256: 0cfff4dfdad7c555e79eca35ca25c4f85cc63ae3c3df8d61f1c85512f2ae4ea5
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 10596 bytes
SHA-256: 0391cb81a1f127d68c4f0291a1f4f93f828d8ca22170483c98eafde5cf944583

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