Malicious PDF — malware analysis report

Static analysis result for SHA-256 9732a355aa20e31c…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 21:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd2c3d05246c910f1614f3eaf5620960 SHA-1: 4723281a47c3ee629473e4add9deecf083357862 SHA-256: 9732a355aa20e31c5dbf6d3152de61b85f11d8b69f3d9a7f2a2a2490efa7cf1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which is often used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://migger.dk/userimages/file/ruxazivepexil.pdf In PDF document text
    • https://distriparkbotlek.nl/userfiles/files/21158990417.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b4617ea81ae94474cdb208ae2b68a594/vazewopomesiviremi.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/wivusis.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631471294.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/10073895586.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/69190610306.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/puxidirediza.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/xasopezesukazujatiwaxul.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xiwilaxumudidu.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/92813722694.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/fimugoxu.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/lowovaxanotuwo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/fitekobigekagekak.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/94574897064.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/9196293863.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mabefipixupuvalani.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/263659254.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/8973903248.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/90764175895.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/wadopuvositenumaje.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jupetosulupiwadur.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/gedopobifuvujaves.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dfdc65d62ee234d32c1b59fc618320c6/sanenilugogew.pdfIn PDF document text
    • http://geodez.com/pliki/file/reragodetilili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hentai+anime+game+apkPDF 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_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 15648 bytes
SHA-256: 24601715f18c698c35ba73832b086a075ad6e71708e2608d43ce24bf12d2699e
font_02_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 10244 bytes
SHA-256: d00cc5d4742f5a872e19ca1c908be059767defce65e6bed126bcb0ff3006eeb4