Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbf7636696c11bf…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 01:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dc1f233f67a2f86baa2e10dc3418a10 SHA-1: 1929e1bf9dadf0294709f724e1b5fd385b221f76 SHA-256: 7fbf7636696c11bf36d026970205368bcff6dcb6221c3887e574c3575294fda5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true destination or distribute malicious content across multiple low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=fundamentals+of+futures+and+options+markets+pdf+free+download PDF link annotation
    • https://ambient-interier.cz/files/files/zaxupuxiloxagepemegazibil.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/38363623192.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/38348777149.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/44888414382.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/rigorowutise.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/3254296482.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/soledidojizijit.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bokijujerobira.pdfIn PDF document text
    • http://bamor.org/userfiles/file/29884572395.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/62383962833.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/sujumaguwaw.pdfIn PDF document text
    • https://people11people.com/uploads/File/gebofuvijevizixumeb.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/bejabaxudinuguba.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/gavomolelaw.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109140452187057.pdfIn PDF document text
    • http://tochuchoinghi.org/files/runofatipuk.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/60734701945.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/xigomobuxo.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/44889246452.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/43457659872.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/gomor.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tejebevumususoduge.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 10912 bytes
SHA-256: f7969f264581ab9bce2cad1525db9dbcc2dc923cf906a0ce1e296c282239ad9b
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 15972 bytes
SHA-256: 57cea1cc93b26fdd55bd8d5b0e51c412710653665f18f9373d40106a898fd31a
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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