Malicious PDF — malware analysis report

Static analysis result for SHA-256 317bd07eace0b48b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0fbc198ac0ccb06936e2a19c0db3442 SHA-1: 9c5606b677b7ab68dd0bffb32ace070cefcc2cbb SHA-256: 317bd07eace0b48bc78740cc4265a8e2b092b66a8d4ceb500a89bb17355d0c45
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or distribution mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/34964206618.pdf In PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/88210176443.pdfIn PDF document text
    • http://suurelepa.ee/data/file/wegewilabasigixojunofodum.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/dizaxanovifirifiw.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/24494365440.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/damidobe.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091212082035.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/39497656713.pdfIn PDF document text
    • http://taperagi.com/contents/files/tipusaxulekusosojadi.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/xapuwalowuli.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910130541.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318621a119c---xotumib.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/pepuzezebeveku.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/dotinepofanosekaguxopo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/37891340108.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/takuvomimigexiladimarowaf.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/14033314623.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/98526132323.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/xexibokijubixudo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9593750f4a6e3307bc4f996ce96f92ea/xalemijinufoxu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/52802669785.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/kejiwexosaxoguralodufoset.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/semadus.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zusitazotoruk.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/somedofigaganusawugelex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=zack+snyder%27s+justice+league+dual+audioPDF 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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10980 bytes
SHA-256: 05958b857ef7af4d88aaee756b17f967812c3fca86a417377a39fdd0b8e5ffae
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 19440 bytes
SHA-256: 9bcba488163d1d191c875eb4ebc6062258ff069b2d0f0401a038f02182e14cb2