Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c8dfa05252fbe1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 15:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddca68e2d0c939f69784953062a75be2 SHA-1: 4ede667f7618326d83a64541b3295b02a80046b1 SHA-256: d0c8dfa05252fbe19f43b014c28d3fcde73821b32a1e95b158475d2001ee6234
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ciaooo.ru/uploades/userfiles/file/87822807627.pdf In PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/wijewefudaj.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/1684860060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fe62ae82---zafowa.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/nezafe.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fizogofesenowizaxubedoge.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/32568937204.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/5147116062.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/dituxojixo.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/fosapuxinakitetosurudinu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/jewomixetuponopamadobi.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/11715469419.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/wamunoxolokagasu.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/bodevoluverekat.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/9761099360.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/46969275754.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/16142131743.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/74234608751.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/saludopejofiz.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/teziwov.pdfIn PDF document text
    • https://unosms.us/userfiles/file/paragagokanus.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/jawapome.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/wijob.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/fuxeritufedewupodemozew.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/murekesurilarosilun.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/28993261558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=positive+words+that+start+with+q+to+describe+a+personPDF 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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 11004 bytes
SHA-256: b57a687c8fdfca51a00d5b5cf14cfcaa17226f041efdadc7665c7a4bd502864b
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 18248 bytes
SHA-256: af3fcc3939a5268b9331fd13f46502cc1ebcf16da0a9d86df6ace49412f63739