Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a761a108ef4e5d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 22:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18d77b22a0e673078591582977594b95 SHA-1: 0d7b69cfdc83dea50a046e1572ac6479cdaa4b41 SHA-256: 32a761a108ef4e5dee66667cc88fef398d7bec2f8388a5fccf8bee0d106037d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tano-cable.com/d/files/26910224260.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/sazatogatulawozirupod.pdf
    • http://samocvet.org/foto/ck/files/31545646193.pdf
    • https://limsurempat.com/contents/files/sujozig.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/83439519658.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/geduvenusugume.pdf
    • http://carrozzeriardue.it/userfiles/files/pibisubopedalowanela.pdf
    • http://wonsakai.com/uploads/files/mokevazomogotofojorefed.pdf
    • http://refpecsbelvaros.hu/kepek/files/13215662496.pdf
    • http://ristoranteyuri2.com/userfiles/file/99496779807.pdf
    • https://atl-50.com/files/file/xasujatem.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/jigekekanalinujerurom.pdf
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/gurejurekamexofo.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/40643399198.pdf
    • https://aspart.ro/ckfinder/userfiles/files/vorolabinafavajubo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aab8ffae746fdd77cc73261d60169c70/51601418345.pdf
    • http://ausietech.com/images/file/33412033525.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kagejigubawadazori.pdf
    • http://ranch.pl/files/file/punosadonuzepis.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7c2a899b---58933187771.pdf
    • http://sahcarpets.com/userfiles/file/tukeduvepipevowona.pdf
    • http://gartenbaukoeln.de/uploads/files/butabadatuxedonobo.pdf
    • http://purofirstli.com/userfiles/files/940189775.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=integrated+chinese+level+1+part+1+workbook+pdf
    • 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_off0000b8b6.bin
12b8597471b40182ed744a941b011b623b0d31d4e2681a568c4d675d018845f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 11284 bytes
font_01_sfnt_off0000d2cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 16792 bytes
font_02_sfnt_off0000eae1.bin
e22245f72a8e1fce35e7089b0ace8f36b7efda4efcdc9a2af63c788e29154791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 19732 bytes

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