Malicious PDF — malware analysis report

Static analysis result for SHA-256 428c523a98c27767…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 02:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 392f05c65f715ea68f79295210c58d2b SHA-1: c9bb2729dcc7278fe412c1528bcf4aa060a765b9 SHA-256: 428c523a98c277678aaf4c2601e34803e101a7733a1ad639f52df60918eab0d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm. The embedded URLs point to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drproperty.in/userfiles/file/57636077546.pdf In PDF document text
    • http://telesson.net/_UploadFile/Images/file/jelaxekejovagelakutizu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/nekuluvov.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/fawelibazugiketuduko.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xujetawanajupezezer.pdfIn PDF document text
    • http://kdekdyjak.cz/data/xuvurosomo.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/73316598848.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/41612734776.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/46904953300.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/53530303477.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/wanikitivenepibogivemipe.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141104d22192---lowuxoxobek.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/wezuxif.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/pumosamidusuza.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef775cb6b7---61739976972.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/91191246274.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/loxelokaxixetal.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zejebagiditakow.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/razipiwixujasefop.pdfIn PDF document text
    • http://korytnica.net/data/files/dubavanag.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jelowuxufaxasedawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pixel+experience+redmi+note+7+proPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/gesapafebefixu.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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 10500 bytes
SHA-256: 8c5e91449d6c50b29ea6dbde87d53e9541cc25840c9af5d9963e25cebd55ebe1
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 19848 bytes
SHA-256: 0e4ee2bcad2dffc22afadd2b4c79ae9b5c9d5ead5fe5d44d270fbe720dc7a2b4
font_02_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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