Malicious PDF — malware analysis report

Static analysis result for SHA-256 db11a45621ce364a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 19:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc7ce47446a605a3d6a71d52cd0c2712 SHA-1: c311a82dbc3e9ab6ce6cd3bd229c8db8587bf00d SHA-256: db11a45621ce364a5c300ecc51b5a979b8627cbb1752517e21c1ccbf1a70d342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and configured with UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm designed for malicious purposes.

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 https://coretry.ru/uplcv?utm_term=argo+vpn+android PDF link annotation
    • http://debten.net/UserFiles/File/41366779064.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/42301633112.pdfIn PDF document text
    • https://ocw.tw/uploads/files/litiba.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/poderadagef.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/11318387755.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ziwuxikagexamijafazo.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/39786636948.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/vunutoguwop.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/nupalororese.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f5bcd45bc1100bb9b6780bbba58eb1a6/dekuwijafisulonuze.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/futof.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/zonitavokekelifopupefuno.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/rijuxokoje.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/bubisawakufafijulu.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/jubixusite.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/20262893041.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/netodule.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/66669713492.pdfIn PDF document text
    • https://diphong.com/uploads/63928777967.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/7775879217.pdfIn PDF document text
    • http://trieuduong.com/images/Download/78806048555.pdfIn PDF document text
    • http://www.og2c.com/images/file/manefebuzaduvudolozedi.pdfIn PDF document text
    • https://bem-sa.com/img/file/51086170290.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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 10172 bytes
SHA-256: b7968cf4b2a23da34f6703960a1f6fbcb5222865b38400dd5c48642cbc3a160a
font_01_sfnt_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 18744 bytes
SHA-256: 5858e849a9ba38759704c950234072eabacd5d4870c8d56fbac7956137e6a97b

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