Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14b2e4a6440020d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 14:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb454c685c21fec7fe028d1c2d7bc0aa SHA-1: 1f1c5b336e5fca1a44369759109ea8b5fcdb4ca0 SHA-256: d14b2e4a6440020d93c7df8df7a38307838f2d3c294295af59fdd711043099f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm heuristic suggests the primary goal is to redirect the user to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://coretry.ru/uplcv?utm_term=in+display+fingerprint+lock+app+download PDF link annotation
    • http://www.leasebridge.com/CKUPimg/files/8706203237.pdfIn PDF document text
    • http://alltechsro.cz/files/tegil.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/21675821762.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/90533140489.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/kixevugu.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/28846156990.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/pizewajufewabudigulowabe.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/34013077858.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fifopirodekovemexesujogi.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/77140710951.pdfIn PDF document text
    • https://redac.ch/upload/wikoxak.pdfIn PDF document text
    • http://baove24h.info/upload/files/xomewuje.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/9738479118.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nolobifofunivimebunoti.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/12043292974.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/26931420457.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/xavazosolesukuzodu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/usue8894pf7e2t3hkeleqvrbnh/17728359398.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133889724596---zexajimukatuzarevurur.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/ziwaviwuxejozulipebudeba.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/pirijurol.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/paxamuvokozuwupov.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/79042768854.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_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16876 bytes
SHA-256: 0cc5b8f10f28577b1d3c14d1d02587a4000ac67a90c9314d9af498c54ad40b52
font_02_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 11040 bytes
SHA-256: 523ab60586d7c623a65536d6be0a7d365d51efbb08bacd301d15282ef661d517