Malicious PDF — malware analysis report

Static analysis result for SHA-256 150341bc62b60302…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 03:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a4155d867762829a5df5034ab938315 SHA-1: 406e5213d4ea8abf66c109ee7a5a9d20dd2d806d SHA-256: 150341bc62b603027b17261ad300fb00f7c012f7994245ffe90506f07ef81a87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature of the document strongly suggest an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.agencesramos.com/ckfinder/userfiles/files/69994199808.pdf In PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zazevifeberonuxiwi.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/tumib.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/24636687778.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/10514971016.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/fuzizadolekatavunikoripo.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/89694168553.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/jotekitidodedexe.pdfIn PDF document text
    • https://angkalaris.com/contents/files/68445335510.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/61481912378.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/lojuzasukinudufagekis.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/tiditubefedo.pdfIn PDF document text
    • http://domuran.pl/files/file/73878400213.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/3938763620.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/wigemanavew.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/biwuf.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091309043337.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/82502692641.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/dutolejapenideso.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/zifububupusurod.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/29596379147.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fixawobewe.pdfIn PDF document text
    • http://hadt.vn/upload/files/ganunuwefuna.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_60A782C8D2DB4833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+shoujo+city+3d+androidPDF 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_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 16652 bytes
SHA-256: e057099ace184f860361d49c23f321cae4c3e22b2099122d04b5da621a3bdfbf
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10936 bytes
SHA-256: 42aff453aa470aec74202842fdfc3e0808369f1583a313a1f232d8ea4cb10956

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