Malicious PDF — malware analysis report

Static analysis result for SHA-256 324f666ef96254f8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 11:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26b00bb5e7da0a4c3a3029d85da69d1f SHA-1: f8512ff19d437f5cd8205f8cb0abd568da6e19d9 SHA-256: 324f666ef96254f872cb4f15270f9fb1ee103d933da9846fa227ba864c8d3a5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef2933854---18480290129.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/wagemajewubafufuvijo.pdf
    • http://d2dgroup.net/upload/files/desimosefalibuwemerud.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/lapaxiwagigaweranu.pdf
    • http://caopump.com/admin/userfiles/file/92404820757.pdf
    • http://bowlingkillers.com/imgdb/files/98516688684.pdf
    • http://nwatchonline.info/userfiles/file/vuzenixapuzodinebexabo.pdf
    • http://clinton.abwingsmd.com/uploads/files/54728677722.pdf
    • https://viettrungson.com/media/Files/sebufesefutagol.pdf
    • https://vcubusinesssolutions.com/userfiles/file/23575816375.pdf
    • https://esterkins.de/ckfinder/userfiles/files/luxekajavusekemek.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/6722999208.pdf
    • https://9ja-bet.com/userfiles/file/mimigesuxeb.pdf
    • http://doktor-okonski.pl/uploadimg/file/xanogegurirabufovuziru.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f91b88cba2---sobasoxarijiximek.pdf
    • http://hyswimpool.com/userfiles/jasevanisewese.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/36389723622.pdf
    • http://vimar.ua/userfiles/files/vubebogijasirip.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fakozurolikokijamonokis.pdf
    • http://wohingltd.com/userfiles/fabejapazebufob.pdf
    • http://szkolka-wiercioch.pl/files/file/zujaxetedamejaxajim.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/88957438690.pdf
    • http://marchmont.ru/imgs/file/sawixigutikisovivag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+avg+android+pro
    • 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_off0000e71a.bin
7a2f5de40c675917dc93afe16db0cbfdec1e01d8f47f2691c686ea373c20c9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 10324 bytes
font_01_sfnt_off0000fe40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 16792 bytes
font_02_sfnt_off00011652.bin
7e226386d50da2a5b8ba4d4cc126c0ceae9372a7e265b8a30be57c81ae9c8dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 21248 bytes

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