Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd56d4fa89f5b1e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 09:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d36d467369b54cd980545db422431029 SHA-1: f516b8080df18e2a3b15501084f462c7142ae561 SHA-256: 7fd56d4fa89f5b1e9b1bf2381043e77504cab21c4487951be94a0e0341d29b2a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://perles-del-beya.com/userfiles/file/dexebiwano.pdf In PDF document text
    • http://idealthailand.com/file_media/file_image/file/xawawirewow.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/romagimizod.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jawene.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/91669568650.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gilulobaraxumib.pdfIn PDF document text
    • http://leeandrewdavison.com/download/takubonodaluwunixal.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/64564073970.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/kuwunazipisoxivubu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/refezo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bosajuvefajigusotuluxawi.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/75686810620.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/parekoseluz.pdfIn PDF document text
    • http://maulich.vn/attachment/files/terewi.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/nulipatewedu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/10059079230.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/jedafozidogufuxomuvuk.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/jebisisapimo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3924a02a9485a5fed42bf9003f4fcd5a/37288793736.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/21610cdd524576e97af5d42ac4d44355/zenenaderu.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/gelopijafozejupipolir.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/56551637709.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/pojonesuketoputolozise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wwe+for+ppsspp+free+downloadPDF link annotation
    • 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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 10380 bytes
SHA-256: 1b10f75ee3fc7a8cfa2ba8e34b67a0c09d512ebe6c2088fb200bcf8389caaab9
font_02_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 18496 bytes
SHA-256: 4e96c9c7d27f3686e3deea8f1ead75ca53fef0760042195298c523d02763cf13