Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf468996a645124…

MALICIOUS

PDF

93.3 KB Created: 2021-10-06 13:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a140034e9ca03987f03ccd30722e3809 SHA-1: bda140bf60d0c0af11a7b3da25dd2db500b1bd27 SHA-256: eaf468996a645124ae7ce9095dc31dc4d644ec91278c527454a2652eb3a5627a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a potential for hosting malicious content or redirecting users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://luatkhangthai.vn/upload/fck/file/mokagimulagoluvimo.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xopuroze.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/wavower.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/51441910866.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/melefigepit.pdfIn PDF document text
    • http://freeorden.com/media/file/daxerivefexafolobubi.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/19204937884.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20211002_E70FD92C034A35B9.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/vodefukovojifitemi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xamiterapuguz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615375528fa5e---46354525553.pdfIn PDF document text
    • http://15881588.com/ckupload/files/zagelunatuzowerex.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/duzovarebuzemudiri.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/83271020789.pdfIn PDF document text
    • http://melvin.cz/data/lebutuzavizofeduli.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/31306545519.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/rajumenofalatejavisas.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210915172814.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/62225200538.pdfIn PDF document text
    • https://masukpt1.com/contents/files/67025177900.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/70003455651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=trudged+meaning+in+teluguPDF 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_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10368 bytes
SHA-256: c67ef6635fc5cfd18e6cdaf759c33e3099f73882868776429f89aa016d138d79
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 21228 bytes
SHA-256: f6932bf5d5183d1acb488a7ccb3f07da8d4b3876d1dd4aba629d087032bf93d9

Open this report in the interactive analyzer, or submit your own file for analysis.