Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ca64293287ae3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 20:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9e4822f20f329996ffb7a57f83f656b SHA-1: aaab6f98013ad33093d62731fb15ff65a1b35d1e SHA-256: bd8ca64293287ae3de08f7f7f8f8713ce708ac1d1053e0a24358ddc45f89d7cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically disguised as a download link for 'wreck it ralph download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious payload or redirect the user to a malicious site.

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.
  • 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 https://huntic.ru/uplcv?utm_term=wreck+it+ralph+download PDF link annotation
    • http://studiomalpocher.it/userfiles/files/20663262078.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/mafusumupozoriverib.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/sisomifuzoluseni.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140affc11df0---88077163196.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/10644685698.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/mogemufesuw.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/wopozobofinosunapin.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61354500A0400.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/tafuzajedi.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210918_114633.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gajujopukagunadofuvaf.pdfIn PDF document text
    • http://www.bash.cl/media/file/94724940553.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911030639225508.pdfIn PDF document text
    • http://stylekd.ru/files/11381344102.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/furux.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/84590469879.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/lajeta.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/2419523776.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/daxow.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109011803533108.pdfIn PDF document text
    • https://mahae.hu/files/files/mamefef.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/38367599798.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/karibo.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/42988053180.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/45155872816.pdfIn PDF document text
    • 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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 18864 bytes
SHA-256: 7626d1bb885e3486d8f925661936b18aec25bff4064a49e5be95542110676efc
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10612 bytes
SHA-256: b400e22efcb20326e50c54b03d14bf71cadbcdc96a4355608eaeba252c0808c4
font_02_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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