Malicious PDF — malware analysis report

Static analysis result for SHA-256 026db113636782e0…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 10:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb930694fbb8130c427ff950db8b9174 SHA-1: 4a15e71459c92c2c66e0156a8f72557fa7df17eb SHA-256: 026db113636782e0961251afde5fc354d7e8c33cb2add7f5e15c6d5bac90312d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to disposable domains and are likely part of a link farm. One prominent link, disguised as a Google feed proxy, directs users to download an Android application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdf In PDF document text
    • http://exima.kr/userData/board/file/4569590854.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/rafukugopokopugem.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/47761039077.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ded3a495---41436401379.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/zelivogin.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46789211106.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ubexabozenisowulenenilo.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/gufamin.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901225302681439971.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/sugavuwofolawetetur.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/72459068754.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/24394581813.pdfIn PDF document text
    • https://duvanco.be/docs/files/dubizukuvudonutabik.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/37311355248.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/jakifidibukagalewob.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/norovunojojupulunuxebi.pdfIn PDF document text
    • https://regenerateacademy.com/file/bemifogimezire.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/kovojokenit.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1afbe191---76163392073.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/sojenunipez.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/54679961249.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/97074131043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spiderman+android+apk+downloadPDF 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_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 10540 bytes
SHA-256: dd0ab0e8cdffe717c05681d598ec61d584c8d5ce8d33406c1acd2d137b6b409e
font_01_sfnt_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 16864 bytes
SHA-256: 1f9a0d47d19652dd4f2c6a22828c9bf7a0e7b65c7df1c59c5e99e8af8ebfe636
font_02_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1