Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12549c0144f11c3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 23:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a23e0241691baa35ccd6f451f314ea71 SHA-1: e7e5b4ff911b194c4abb1a4c56157fd9c6bb0893 SHA-256: a12549c0144f11c3759e3a5bb77940d086c5f2701ff6e01dda2d5368163969c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://ilonew.tasksplan.com/ckfinder/userfiles/files/44412071118.pdf In PDF document text
    • http://yongchengtech.com/uploads/files/202109131909509108.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/34557783247.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sanedupolobebosimawapus.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/82678572790.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7a580c89647a52a43fae1073ba4c5db5/masofenokujamumiviwo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/15814807194.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/091247412369.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0c34af7e---xiweturuwakadabazux.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/61785258465.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/tazasuxigenafosuvomimad.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/37471666731.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/jekevu.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zojanapajulirowidisoj.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/60271227707.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/87777295688.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210917202935.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/fodagezidafupivudo.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/feveguzufokidafoje.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/fanuvodobig.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/53807152400.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/47806348190.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/16802512055.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/mujosotidurudagakil.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/petuwogexekudakedulifufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+export+text+messages+from+android+to+pcPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 11096 bytes
SHA-256: a2399409a629af223e24d67d537c4596fdc3ce9616b6d2eba52ac02aef36a3ef
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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