Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ab8d3989dcce5c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 00:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 432063a481c65e6d3c4d165efaaa4df7 SHA-1: d21ac53d6d2762cd191d4c8761d1ea2e1075c3d6 SHA-256: b4ab8d3989dcce5c05c7d142e7c9fc83e50b30bfa5d9b005f95bd55f68ac0360
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=react+native+read+qr+code
    • http://www.globalnautique.nl/upload/files/mizobuta.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/panepulaxa.pdf
    • http://lighthouse-connection.at/myPix/file/nefawuvapasa.pdf
    • http://mayinmaunhat.com/upload/files/6008439625.pdf
    • http://sieuthibds.net/images/files/gabisudaku.pdf
    • https://actorconseil.com/files/file/foruvanirilexar.pdf
    • https://panelshock.com/userfiles/file/fowarupagezi.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/barojabatosimo.pdf
    • https://navliecky.net/userfiles/file/1208699722.pdf
    • http://exmar.it/foto_fck/file/52403282766.pdf
    • https://computerzone.pk/file/guwano.pdf
    • https://cvzona.lt/resources/img/files/19164110666.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/lepadunawemurib.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614064764b8d3---zakevukujawusutabegero.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/82478879494.pdf
    • http://viquadro.com/userfiles/files/12455528690.pdf
    • https://ctners.com/ckfinder/userfiles/files/zodepolukivilupopojewuz.pdf
    • http://glavis.biz/userfiles/file/55896535098.pdf
    • http://kientrucnhacuagio.com/upload/files/32345110833.pdf
    • http://dulichtantai.com/files/uploaded/files/97952394912.pdf
    • https://forexinc.ca/upload/editor/file/64755097260.pdf
    • http://prosefkuchare.cz/userfiles/60186736217.pdf
    • http://csc020.com/userfiles/file/20210901074919_d4nw0m.pdf
    • http://elite-nails.pl/Upload/file/jigosevumoro.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b93d24a35---ritovizilitesudagulomevi.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_off0000ecfa.bin
655136fd29e8a58a2a7ce862a8b8e28e1de7385cbdf409762958d3a5de02d8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 18680 bytes
font_01_sfnt_off00011e55.bin
968225aa64254b35c86dab4b719a9a5ed0f176e93bbaadd0a993a5c36fdb8210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 10408 bytes
font_02_sfnt_off000135d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 16792 bytes

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