Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab65483c55bc0c3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 23:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd8235a4ad70a4dc5cea653ce437a854 SHA-1: 8b05a32718e715f40b892558d3e5df00ad5565f2 SHA-256: 7ab65483c55bc0c386ab5a466fdcd6e312bc3b9c620fa44d390588d6bed67bea
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by an ML classifier and contains numerous external links, many pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a malicious intent to direct users to potentially harmful sites. No scripts were extracted, but the presence of many URLs implies an attempt to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ceramicasvillaflor.cl/UserFiles/File/48529933998.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/75702756873.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328e8680a0d---33272959176.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/37714360824.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1bd27fd13af8ec98bfae6e01620359b8/wujogedeziromotimut.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/47052992449.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pusopoxamefenu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/83830061313.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/82664018499.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/84242553845.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/23433873591.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wevexaxopubi.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/68337006016.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/73695852108.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/76216731245.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/87619918901.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/9037780593.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/talatuzazenejanonuxiso.pdfIn PDF document text
    • https://clove7.com/userfiles/file/61303219490.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/87395135626.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109030905031851.pdfIn PDF document text
    • https://iwistw.com/upload/files/fotibapemupopunimoripo.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/kugumebepizelila.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/94323731468.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/41089693336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+get+my+phone+to+mirror+on+my+tvPDF 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10720 bytes
SHA-256: e07fc812afeab1e08f7b0844735ad385fd05abdac5482a001305f88f91bcefa9
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 18392 bytes
SHA-256: 4b131aec20136b3833556d67cded5fdee7bd79132f249f9f282dbf9adef0fb85