Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af2d3e276e9c64a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71f0436e2f9ef1f952cd4b134eb795bf SHA-1: 835d0532b71a67f94636fa74e68e0e38f66d2186 SHA-256: 9af2d3e276e9c64a036364205f127df7bfa891a7be74cfd4be87aedfe1522cb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious sites. The presence of a link farm and the overall detection as a phishing/trojan PDF points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://flexi-cms.com/uploads/file/82272045147.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/pipufegudu.pdf
    • http://thailaundry.com/imgUpload/files/renalifuxusesumadevefa.pdf
    • http://wib24-admin.de/uploads/file/tezilewefenimanonupava.pdf
    • https://baohohoanglong.com/userfiles/file/rabume.pdf
    • http://cyc.cz/pictures/clanky/files/bivopisirozosazejiwomorud.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614364e8c4653---38007661388.pdf
    • http://tlxzkj.com/uploads/file/120750476719.pdf
    • https://hotelindigha.com/FCKeditor/file/xorejezixokudusomatilizij.pdf
    • http://kxqcgs.net/filespath/files/20210914183134.pdf
    • https://tsolisp.com/files/file/85660365700.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67916475742.pdf
    • http://yjsyrj.com/userfiles/file/13996084064.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434ef12e22f---82002728458.pdf
    • http://homeopathyhk.com/files/potaxekexazofilagev.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/jideviwiromoridebelo.pdf
    • http://www.jindatunnel.com/up_files/file/67044864115.pdf
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xidekigivo.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/63653036607.pdf
    • http://fruitvita.com/files/files/74406216832.pdf
    • http://ipublicity.cz/data/file/runuxowax.pdf
    • http://0-50.ru/userfiles/file/87305504194.pdf
    • http://castudio.eu/userfiles/files/zujivizoxofopananani.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+turn+off+website+notifications+chrome+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ac.bin
8f44cf8ed1205feb6aa0ec8727fd276cce7807462be375e57d41e1d9b2d097dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 11012 bytes
font_01_sfnt_off0000ea1b.bin
b5fd27a9dd0799a2c45e19523d8bdb9236de34029ea82f8538c65b4161d3a019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 17820 bytes
font_02_sfnt_off00011880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 16792 bytes

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