Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0ae89b99df6140…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02268d7a7554432af344f382d15c00c4 SHA-1: 159a7244b95921393bb92eb728eec29afd6ba45e SHA-256: 4e0ae89b99df614034e044f25241729163ec415e84e481ec07b969c1769ff4b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to deliver malicious content or redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pistant.ru/uplcv?utm_term=techlector+ppsspp+games PDF link annotation
    • http://morgancountyoh.com/userimages/59468760943.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/temokukuginidefixegiwisew.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109260136029361.pdfIn PDF document text
    • http://alptw.com/images/files/53619602947.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16151ec983e8dd---basovexogaboj.pdfIn PDF document text
    • http://wych123.com/upload/files/68156361422.pdfIn PDF document text
    • http://metallpress.info/files/96485870124.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/sisutesufudotap.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/velumataxu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386c88669e4---62040965958.pdfIn PDF document text
    • http://immopolignano.lu/images/33508840359.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/50104792262.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/83343951333.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090120523370554.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/98623588370.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/15321246201.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210904165435.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/27183447173.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/15284362752.pdfIn PDF document text
    • http://thedreams.cz/files/54439485986.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/vawinumokejejosike.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/19404637384.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/dopitazimosiwidamosisinuj.pdfIn PDF document text
    • 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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 17604 bytes
SHA-256: 44abd4ee472fb09ee8e4e4e4e815cdc2de2aa3411a978885419427ee699ba6f9
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10588 bytes
SHA-256: 674782817c49351bc62be572f4f0df7c77aca608326b46e8b460a2e03e1e7183

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