Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3759060f2296cd3…

MALICIOUS

PDF

98.3 KB Created: 2021-09-10 03:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96d4171321ed80928927d91ead46fcac SHA-1: f675aa0907c3f69509b5d8d4a365468a626f5082 SHA-256: e3759060f2296cd3cf1154753cfe62fb3d659c95ced91af367e7633f71d56f05
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to redirect users to potentially harmful sites.

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://batdongsandothanh.vn/luutru/files/46169647154.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7308dc1d---69038779847.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/tilipizazo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/24977777987.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/pefitumugebasigoduxam.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/mejewopatowoxu.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/velojosunu.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/wotazabulotijuwatu.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/66457812057.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/75669870607.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50832792207.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090912445573499.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/96597041087.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/labuzi.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/pitegivosevagewelupo.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/73919635675.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/vuriridebizemegevafo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pigesutevisirelozo.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/fereke.pdfIn PDF document text
    • https://suksesunited.com/contents/files/12439572062.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/sezipozizimosuxuli.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905203523.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/67770520921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=us+is+a+constitutional+republic+not+a+democracyPDF 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_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 18688 bytes
SHA-256: 894ac7356085e8d81edf201a5ae4a615d8212afd2456a9a940a8148267d11622
font_02_sfnt_off00016197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16197 11036 bytes
SHA-256: ef4d4d0af5b35f13b013ce006d275d4c2c846bb2c2983872a4d07df376f71d55

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