Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7e12967d15a23f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 02:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdaf6a1cd6eb6777b0601f3b60277d30 SHA-1: 6de02c0a7c107adf8c9447580f1ab147ef4229f3 SHA-256: eb7e12967d15a23f772118071bbe1faf5922863099d76fb05f4b8f3928463ba2
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. The high number of external links, many pointing to potentially disposable domains, indicates a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://retrolondontees.com/userfiles/file/japuwani.pdf In PDF document text
    • https://shibbirs.com/media/files/foxemukalokogowokidesakot.pdfIn PDF document text
    • http://strandedtattoo.net/file/gonepovoginuwurakagi.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/gomekagixigonujotubogul.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/1633195579.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/ripepulukogemutujisemedi.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wazurekidudekixenivavo.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/25249012683.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/manogagipafup.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c571114e8---xajara.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gazijod.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/42053279964.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/mirag.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/mosujunajave.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/zenarurejanejawamofakif.pdfIn PDF document text
    • https://ikansambel.com/contents/files/16848473172.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/gujunadowozu.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/nifubulobukumo.pdfIn PDF document text
    • http://finchamauto.com/pics/53090226269.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vosulivatoje.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/33734014733.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bfd730276d4d0a4c1ee4c1d99c72cc17/dokugebi.pdfIn PDF document text
    • http://strap.sk/uploads/files/ramizexakonef.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/putilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+one+and+only+ivan+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 10372 bytes
SHA-256: 77d3aa74f10b4f688bc581ad142cd1b79f70c055274d6210a3cdde843020a740
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 20776 bytes
SHA-256: c87e8ea9a4d9c834786adc7382c0fa51f53b551033dcb3be2cf75eb5323e3207
font_04_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 16244 bytes
SHA-256: e0f7e1ead2a564854c16c05c2668c30310c9081ae0901f94be9ebb68b66b58a3