Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e256e39001fb639…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 03:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b90729d81a1da5b29347a6b3fd2a8710 SHA-1: 25e1675e0699efbbebcf520a4297182ae733f54f SHA-256: 4e256e39001fb639ef3b3d30faf57a49c8f1ba037614e0453b09d8cf7205073c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ehbo-oostkapelle.nl/userfiles/file/20679481431.pdf In PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/10791679388.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/99300087678.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/74125580915.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/82623344127.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/muniguwivute.pdfIn PDF document text
    • http://esangsok.com/upfile/files/zizuxuwerivopemezepumu.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/90683337453.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c313a8c4d---lipaderukulitijuzosow.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/16766801858.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/6284273422.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mujopejabagepabuko.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/89044219091.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/tagedekofanex.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/45130495127.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/mekewi.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/55813343366.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/bonawokatinevu.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/38609848961.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/molutifedazupozi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mawawosubaxufofusujame.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/bugosufuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=10+percent+body+fatPDF 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_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 16492 bytes
SHA-256: 1656d81ce2df8add1eea17080e4656ac12409d02a237bdffc3f314f426906fc2
font_01_sfnt_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 10640 bytes
SHA-256: 3acc42997ad3c6780534644baa5e8a4524c50d267d03e8963f2f3ec6d1a06101
font_02_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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