Malicious PDF — malware analysis report

Static analysis result for SHA-256 1168dc18c79ec095…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 18:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b390d76bbcb960babae730e8ed797b93 SHA-1: 48cdcfd64d8b18d8497b6dad98de27eed8ae23e1 SHA-256: 1168dc18c79ec0957ac743a0f4eaa23695ef4a2d4ec47edf2db6b045413497e8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to distribute further malicious content or conduct phishing. The presence of embedded URLs suggests an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 4

  • 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 https://crewmak.ru/uplcv?utm_term=force+android+app+landscape PDF link annotation
    • https://hahapediatric.com/uploads/files/202109031249599025.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/59953893721.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/gojuruzubawumowob.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/lanarisuwelisemisagiruw.pdfIn PDF document text
    • http://abwrva.com/uploads/files/87496413518.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/55738368404.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/35968055886.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25711855863.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/jugetasagafowavugas.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/berujajetivofepuxedoba.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/87665994952.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/wifasakejepidamakat.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/11163262450.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50241695826.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090316282273499.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/84779268182.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/78995133966.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/laruxegamivapi.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/46012707096.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/zoperuvutuwanavanogid.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210901213607.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/68307444847.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141845f54597---91782042086.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/42745081954.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/53938726149.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/ridoralobum.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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 10388 bytes
SHA-256: 67fde8ec741d5ca5aa6d2523d6ea7cd1f1885a7435406fc37ce59a413077fe1c
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 17484 bytes
SHA-256: 23b6661b866a7a02393c24d2ae4b4bb628aab1a2c904af9b8a4080095fd2b84a