Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5fd06029e71915…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 05:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40d4f9ff2758e6c3aa54ffdc0c3d42e8 SHA-1: 9615d7274fb88620e31e85924a346fb76b0c6032 SHA-256: 5b5fd06029e719156780c26c3f536ca5dae05ff0a3755eb2e8a2bc8c87cf9a8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection attempt. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.naturhalles.fr/fckeditor/userfiles/file/5824229386.pdf
    • https://locktactyuma.com/userfiles/file/17109843897.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64427882547.pdf
    • https://mclandpin.com/calisma2/files/uploads/miluzuvivevutapofi.pdf
    • http://thenext.pk/userfiles/files/munewimapegufevulik.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/6907184603.pdf
    • http://joy05.com/_UploadFile/Images/file/lafazejigejobotufibefi.pdf
    • http://seibyou-koujien.com/files/files/34299120911.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/50939e6922b828268131bf7073d22447/15150697269.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/44400963310.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28835633479.pdf
    • http://ever-pioneer.com/upload/files/kapipuvibekubufimiluze.pdf
    • https://imagebrandstudio.com/userfiles/file/41113383222.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/30635991437.pdf
    • https://allcreaturesinc.com/files/files/62905459090.pdf
    • https://digicpictures.com/downloads/tudezoruferuzigoxow.pdf
    • http://gelinyuanyi.com/upload_fck/file/2021-9-3/20210903130437510631.pdf
    • http://rescue119.org/userfiles/file/nevumunipexenunejadu.pdf
    • http://ansonseatery.com/uploads/files/mijeredonimudumi.pdf
    • http://curry-box-deluxe.de/userfiles/file/radar.pdf
    • http://studiobardinisrl.com/userfiles/files/42373871432.pdf
    • http://liebherr-tr.com/userfiles/file/73964379470.pdf
    • http://bumsnab.ru/uploads/files/87657683165.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+audio+trimmer+for+android
    • 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_off0000e2d1.bin
5aa9609e0f8cb29a30864509faa7cd72d5935c22830cb18f2abeea9ffc29a7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10620 bytes
font_01_sfnt_off0000fb1b.bin
77f531acd33e88a343b5b188704144b551f72c264a863d5160a048c6d200cac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 19468 bytes
font_02_sfnt_off00012d65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 16792 bytes

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