Malicious PDF — malware analysis report

Static analysis result for SHA-256 4889854182ebeff9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 01:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b588a217663cd1cb31d5434c0963190d SHA-1: b727169ac072f1b2eed0da999ce6b56bef8ce75a SHA-256: 4889854182ebeff939c0251a767a08f705974471420fdf2dd4a473eeecf57fe1
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://istocdukkan.com/userfiles/files/nubopewuxopatapo.pdf In PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nuwiruga.pdfIn PDF document text
    • http://popmetre.com/news/files/xipefonagetobatudelo.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/75862344794.pdfIn PDF document text
    • http://erex.hu/upload/file/46019378145.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/469312e54ce02f85dd6f3b74d0fd30ab/35958883386.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/zegalepiwexonowusitofo.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/fonelulofetakavafomudekup.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/39295013622.pdfIn PDF document text
    • http://datcat.vn/2018/file/fizonorarubo.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/33258149069.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/50417527248.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/21193760675.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109052227242042.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/sasudoregulefije.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/87530830243.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/61804658152.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88409656f---firut.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jabumidorejivunedub.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/34100328537.pdfIn PDF document text
    • http://schubert-hh.de/image/file/waxowufuvozavegisixegite.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/zasisuwel.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/46734116886.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/moguv.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/91019174053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=psiphon+108+handler+ui+apkPDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 10964 bytes
SHA-256: 9b0779275ef20672a82615a06483ce56c148036e937def2af9dd28ac987cdd2c
font_02_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 18320 bytes
SHA-256: ed22c4052047ede2638efa951f12c09a929f575aca46955130ccf49370450856

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