Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a87d2a8d5077c3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 00:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21475da83c1039097b2572f4a21f02fa SHA-1: fb31160041be84f0c9fe32d01cd7fbb72b5d603f SHA-256: 75a87d2a8d5077c3be8e623b1395eaecf9270c175bac50de933efbcc5f600651
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=mast+app+download+without+watermark PDF link annotation
    • http://dmhu.eu/uploads/uplib/file/35052728841.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/84400151845.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/29564721345.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140066821504---gemudo.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/runupavodoxenomuri.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/nusojovewukupejor.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/xekakebuvubetimapulu.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/99809403590.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/sosajokakazokagin.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/87762445603.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/50525645672.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84337259072.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/ralazupibawakanejafiteb.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/76916663994.pdfIn PDF document text
    • http://ipceurope.com/assets/file/bagotilamus.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/tagugevipuwij.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/toxikapazosubulijanevaji.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfbb7adf9---85659182335.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/12943859986.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/95329508310.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/kedavoxuzajisoniwaf.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/wotigak.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/98844375074.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuwidiwumigife.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/xewaduwevuxilurun.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_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 19444 bytes
SHA-256: 0c9498ddec647c9f16f427a70e9047f4d4898957d8fa6e15b9a11625a1c24d28
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 10928 bytes
SHA-256: 2cb7788cacc7d794bd276feb15e4e3e5df0571d0c7ff83bd07618a1174bf36a9

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