Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefbf2863a0473b5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 11:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac926fcd5759349a9d9e7f02b82e823c SHA-1: 6ef1133a9c65a323938334acd224151ee8143442 SHA-256: cefbf2863a0473b50fb376e5c5b4b645cf6b91f5f4d23ec098caf325355643df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stalbeckers.nl/userfiles/image/file/23380845748.pdf In PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/40128286991.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389f1f2a7aa---gaxofo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jimarogebutaxerefer.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8eadc8908---74260688204.pdfIn PDF document text
    • http://surausa.com/uploads/files/73897193464.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/fafaxiw.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/nojosudimunup.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210907001627.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/12734354076.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94076519769.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/11817045378.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/58271065293.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908085523.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/64190940882.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-5/20210905051759268818.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/32970567734.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/30734972106.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/joxanimuxugos.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/21975185407.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/linugorexodapubom.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/sagitugusozorimozog.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/17413776933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=los+angeles+android+download+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 17424 bytes
SHA-256: 4a6f45f03e273d2027fa8f89d5d4e08789d863be027a6e98ef26cfef815c74fe
font_02_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 10604 bytes
SHA-256: 9108badec3aaa9f45aaf799b5a2961a330146d66e1569d00fb626aea71e63e15

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