Malicious PDF — malware analysis report

Static analysis result for SHA-256 6beef6f1576cc59d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 00:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2535d4c7998990a6c6f7198ba2ac11f7 SHA-1: 68414b58fdc7a2f9294348aa53f7c937dc148f0e SHA-256: 6beef6f1576cc59d5c7fff9e99487082ccd307f844def5f07cd1e16ae5e1a50e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings suggest the PDF acts as a link farm, potentially to obscure malicious URLs and disguise the true purpose of the document. The presence of numerous external URIs, many hosted on disposable domains, further supports this. While no scripts were directly extracted, the overall structure and detection suggest it's designed to lead the user to download a secondary payload, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=drag+race+season+13+finale+online PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1a2d575b0b6b54e4ef80498a61cbe1cf/gagesoge.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/kurumosadizudinozukozinu.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/87247360755.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/tedudojunuxugasusisiz.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/puvoxuwawew.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/vomawikis.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/91470732188.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/42033712762.pdfIn PDF document text
    • http://att-na.com/upload/tuzeganewemaze.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/daxasisiwopadesi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d9ec2c9897a154016bd3f95ea8e25d05/74791109193.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/kuvesumirarojoxidena.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/wawigofatoxojunidepepobaw.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/dugujegibakagi.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/wezabumekudut.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/4788098801.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/96786332260.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/luxifasuwawiju.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/28323028997.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/duzoxumogedenufox.pdfIn PDF document text
    • https://producto.works/userfiles/file/bitured.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091405233724.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/filatutesidilunejigibas.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/vexuv.pdfIn PDF document text
    • 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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 17204 bytes
SHA-256: f54db3b2c1aaf8f4e561b1dc987de46473b20f793e2d546d779e8a95691c64e8
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 10640 bytes
SHA-256: 5b7934367b786b78d2e70793da7563b37d1b1b88c4a7120f2475386c02650bac
font_02_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1