Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad57c30b8e2807d1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 09:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34427c43d5d0ab96763b3a7a96d1d76a SHA-1: 76e2c0e08d4d3c4fe09ea1c763045471a4166603 SHA-256: ad57c30b8e2807d13eb64de2a93d88e6b430d2570710dbc882cc50038168c076
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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://chingyi.tw/userfiles/files/rinunelononalaba.pdf
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/21039957045.pdf
    • http://5lovestartw.com/CKEdit/upload/files/vukomatujin.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411445a3129---tedaruj.pdf
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/zifogimebafox.pdf
    • https://nomortiga.com/contents/files/tofikisiwinuzux.pdf
    • http://dnepropress.net/files/file/58347999484.pdf
    • http://rubensova16.cz/files/file/jivuxebe.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/naxowarajabewo.pdf
    • http://pjzhengwang.com/upload/file/20210909_033541_176.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/pifutexorigopokoj.pdf
    • https://giolog.biz/images/bulk_images/files/julonosebofanewosidobu.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/50682770053.pdf
    • https://iqrainternationalschool.org/_assets/files/potamugelutek.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/18343586255.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb242d71f8---48728092229.pdf
    • https://signika.pl/Upload/file/70664223536.pdf
    • https://mayphotocopydogia.com/upload/files/tolupanidoxuxumumeduregu.pdf
    • http://citra.cl/userfiles/file/bumodupewaxadujofo.pdf
    • http://begues.mobi/userfiles/file/tepaf.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/87069467304.pdf
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/pemaviwogujogok.pdf
    • http://spielundlicht.de/content_provider/documents/files/bogulowumebez.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1200230774613afb961bf0d.pdf
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/witadogakasura.pdf
    • http://aostavet.it/userfiles/files/64831356993.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=schrodinger%27s+quantum+mechanical+model
    • 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_off0000e84f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
font_01_sfnt_off00010066.bin
ac06314f9b31552f902c12a6be71590ad6aa104dc37c9a664bc017c9c16ff274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 11172 bytes
font_02_sfnt_off000119dc.bin
1548fa9c06b39ed5bbc7407a5d26797b3f80125a32aae80822f3de0a8874c353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 18748 bytes

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