Malicious PDF — malware analysis report

Static analysis result for SHA-256 854ab4a5d25df7f4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 22:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83fd5a7a2c4105f7873d546bc869212a SHA-1: f812ea30921e06271526c63c17227d9f6e72e3df SHA-256: 854ab4a5d25df7f4b76c00dae2b5638fe0bfd1d35383ce47c9a7b09b84617990
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains numerous external links, many pointing to disposable hosting, and a lure for remote support tools. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to trick the user into downloading and executing further malicious content, potentially via a remote support tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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
  • 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://sakem.org/userfiles/files/kurujezezadusibo.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/motoremefopovusedo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/68651793475.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/34253183897.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/mamadixiletataroxanemelu.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/tokow.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/makovuxodonelefudeneme.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/83929798655.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109032257142203.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140422c732da---66414685864.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/40026422435.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lojupuredoralofup.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/porisasilabawi.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/46143655490.pdfIn PDF document text
    • http://bakoca.hu/files/file/90533501082.pdfIn PDF document text
    • https://olterus.net/contents/files/duliwomerirezur.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/16987812866.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/worokapewake.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/dituxebafemuvorozo.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/nelalimofet.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0d50322e910e75264b2cc667ab7f58a5/kolidebemubezuva.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mexezalixaneresitepewara.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/80403367439.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/ladozegakuzisoter.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/neniboxejosisegasiga.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/69609327473.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/8860752632.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/86041715008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+screen+time+app+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 10712 bytes
SHA-256: e7efb4ab7a0661dace8831d3ede09e179dd85ee84caec5b5e9d32c5b268111f4
font_01_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17884 bytes
SHA-256: a45734c0a6c902ed4b653fd287cf9e5e5fe45e1b0b381270e7879a72131a5f7b
font_02_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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