Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f6e72ea210f6b2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 22:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa9cae889513a46d77c29b10f159e3fd SHA-1: 8dce151296bb05ce88ff0f7480a3b8a62a4a28d8 SHA-256: d9f6e72ea210f6b2c62932ccd844ea63d8f46088ab5d0ceb3e5a5ba160a95132
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lukoilmarine.com/ckfinder/userfiles/files/28909448495.pdf In PDF document text
    • http://weifong.tw/fckimages/file/66120596445.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/67957321607.pdfIn PDF document text
    • http://baove24h.info/upload/files/tedetazadexobonegaxozuwet.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/jetuzitopikumeti.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/72403300138.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/baserudivotejez.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wibolipe.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8967cf2ce---51996245947.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/48824148958d66aa76cfd133900afa0b.pdfIn PDF document text
    • https://pixel.bg/img/file/didofatogoxevemuj.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/69694611145.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/33716592212.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/taneda.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/39110393206.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xipite.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/97966856302.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/mivilebotinev.pdfIn PDF document text
    • https://posh.hr/files/tibujemelawax.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/2894059121.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bidufavumejosijeseruxelib.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/41812335726.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/duwidotalututilixedusexax.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/32703845719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=parallel+space+apk+proPDF 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_off0000ae70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE70 16620 bytes
SHA-256: 85ee93fabfcd6e8756dfdf1d55cdfcba7ffcafbd7ef759c5d49b86a2e37af269
font_01_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10168 bytes
SHA-256: ec73ec75d169e9699a7d3d1698546c7341c83b49e1cbcbffc42c4670aefb29c3
font_02_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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