Malicious PDF — malware analysis report

Static analysis result for SHA-256 7783ec519d7882ff…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 12:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dd63eaa5dc56b8812cd6d6810c64eab SHA-1: f2cbabba151f8abb7d3b29baa01bfd7c505eb8a4 SHA-256: 7783ec519d7882ff75fb2b21698f7f84ed868a058b488d2fc4043f26458c609d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body was unreadable, but the heuristic firings confirm the malicious nature and the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bestcaps99.com/ckfinder/userfiles/files/xoxirat.pdf In PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/tixurepotorerabuwuwab.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/30496866564.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/madefuzujesijajalujo.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/fupumi.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/16032597225.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/56971665717.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xedemizo.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/pesawusafunema.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/72705343254.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/nevafakarijesirorexugi.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/rutibaxetotepulariwokexug.pdfIn PDF document text
    • http://paron-rebondir.com/uploads/files/gamewowizodipagaz.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/vebawukuguwuduv.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/kejuwojemu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7c06eed00f54c91d08ef49a6c6014a7a/35046831502.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134929dacd81---11719279699.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/52120380428.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/46429227528.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/pezuwivibetegagip.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/modivijekap.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210911094415.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/13157389287.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/17437363929.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/nobafenivemidubupel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=native+ios+androidPDF 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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 19212 bytes
SHA-256: f532ed171ee4bad08a4a8a165c4e02f45e220288d49d6ffc69d6e297f359779e
font_01_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BE 10236 bytes
SHA-256: 179dd753c1c074400dc3cce7ef9eb08027e8a59df94b352848b7a7cd9df5ae20