Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f3190dfce7c7d5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 15:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01f9f14efe589f1a79fd628bcb5e2f05 SHA-1: 9d783f00bd10c726829825a9ac7074fd78232ecb SHA-256: 79f3190dfce7c7d51aabe7b0c1cb843e113b84056ffaf5b7457430d0f135c490
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The presence of multiple distinct hosts and links within the PDF supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nnkcreations.com/userfiles/file/89941943162.pdf In PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/53063318250.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/7849193756.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kakomeze.pdfIn PDF document text
    • http://sireny.net/share/files/wesudidamu.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/kejuzufemewedemexapuloz.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/foxofopefobelu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/437a5a444707a5fec106098c6da568ee/fexovigemogibuf.pdfIn PDF document text
    • http://simoncaulkin.com/images/90040008731.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/sonobarufixixebojaponomug.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/88930347954.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/kaxaxe.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://avalon-essenzen.at/userfiles/file/tijarikewanorijiwamewato.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1e065fadd---5029949201.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/12687602684.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/82027172331.pdfIn PDF document text
    • https://businesslife.com/content/files/96089831374.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/81473417874.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/94550476303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=4g+only+network+apkPDF 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_off0000ac5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 10440 bytes
SHA-256: f59acda05bfa16d60c2401afda0ce57097feb5d3aa068ef85e9a3626e866beae
font_02_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 17320 bytes
SHA-256: 64c8c05d15c6c2d6e10a10f79906d19bf183ef6211110a700b14d0465b254929

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