Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1b44e579dcdc30…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 02:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f14b5bae1cb88eea194193cdda91ef5 SHA-1: 353f1fd8921ca901215831ec7babb86ebf9e2f5d SHA-256: 3d1b44e579dcdc30607601fc7f2dc4c6f2432c02716bc5198383d5272f207f1b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains and structured to appear as file downloads, indicating a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9065

Heuristics 4

  • 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
  • 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://dh-life.com/ckfinder/userfiles/files/35924058337.pdf In PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/16248971986.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/mesev.pdfIn PDF document text
    • http://tfforming.ru/d/files/zapedikawe.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/9302008366.pdfIn PDF document text
    • https://emmaushuis.org/pages/23622103411.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ceb490d11---48719911000.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fagamevanifore.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/nugezesidabeburu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556a99a22c---16943954366.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/tumoxufonokejel.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/kelajotafopibonoredijisum.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pawoxadivowakilate.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/wujutifowazo.pdfIn PDF document text
    • http://nensi.si/upload/file/49964862490.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/23279294496.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/55438690103.pdfIn PDF document text
    • http://turatabor.hu/media/59564580753.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109060650253430.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/monavekizofo.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/63582006472.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109080528395444.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/95982499884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apk+gta+v+5PDF link annotation
    • 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_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 21332 bytes
SHA-256: 507c6db66bcb7168d68a2abb2060d82868be95ff4d236d99740889fd3941b188
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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