Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafc1e02f748cdde…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 17:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5760370adc5f0762a3d5ad6583c10a6 SHA-1: 08ebc6cb2608e3b8a9111869b810b222533e7041 SHA-256: cafc1e02f748cdde2af76d3267ba853176f5593e71283077d9af736f3844ba36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. It also features a high number of external URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://dautuck.com/uploads/userfiles/file/25172629589.pdf
    • https://tinhhoaxanh.vn/userfiles/file/pavanukarajetid.pdf
    • https://atlastoursntravels.com/userfiles/file/52329556584.pdf
    • http://arci-mp.fr/admin/File/7784042768.pdf
    • http://sowiik.pl/userfiles/file/43751165197.pdf
    • http://lindendirect.com/tempimg/file/84340954694.pdf
    • http://szyoujin.com/UploadFile/file/20210927181623229.pdf
    • http://peneleos.pl/userfiles/file/73486083973.pdf
    • http://briztravel.com/upload/files/95328133095.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/46102601040.pdf
    • http://brbud.pl/userfiles/file/41184850588.pdf
    • http://travel-door.com/userfiles/file/59207713303.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/32945166bcf0eef184453a0854e6cea7/43856091075.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/6506341037.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/miwodurerufanuwejolugized.pdf
    • https://medgal.pl/admin/ckfinder/userfiles/files/68783139886.pdf
    • http://gramercy-grand.ru/files/file/14042202898.pdf
    • http://kirilmazbardak.com/userfiles/file/45993423476.pdf
    • http://ortopediaszombathely.hu/editor_up/15035979956.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xepelaxegemegag.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613448471d26f---69043209819.pdf
    • http://sanfrancescovet.com/userfiles/files/faduzuxomurimavowunul.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/18423513231.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+stadium+2+zip+download
    • 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_off0000ad54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD54 16792 bytes
font_01_sfnt_off0000c566.bin
7c1d11be5b3e6cef67aa5beb44cf7d1b7c31deef84919a9f3021e778ba904bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16312 bytes
font_02_sfnt_off0000ef25.bin
b7ce8d92785ca814d284c66f3e2428e5c9ba2cc4fd72805e0e0b856a845f1cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 10912 bytes

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