Malicious PDF — malware analysis report

Static analysis result for SHA-256 d610239b5a401bc8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 21:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 76d346d8cf98e00ddeeb24f87ddb1004 SHA-1: d463cceff075f39f35a3a4de8b80a9f0542c1d12 SHA-256: d610239b5a401bc8d9bafb23829069a29117492eaaaaf7a850a4e54aad3cc27d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, including one disguised as a game download, strongly suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://braghieriarchitettura.com/userfiles/files/fagakelibegajenatukolevig.pdf In PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/lijurovusalowalivurujop.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/13615721040.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/79473399868.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/27489208418.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vaduweb.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/gosejuperuwobugulokejemip.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/90512266878.pdfIn PDF document text
    • http://imbirimbir.ru/files/gaxunefet.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zexujupokor.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/72638958742.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/tawugimotakexobitato.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sebibutagu.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/dupupevogobo.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/59833147599.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/55062005405.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/12147908814.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/78771953222.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d7e58078---foxezudozidid.pdfIn PDF document text
    • https://jotelek.hu/files/file/23514793078.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/55d3f624b537e7208fc5ae5bbabdf802/17107482211.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/89170563946.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/43741066735.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/21105667479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=angry+birds+star+wars+hd+mod+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 11072 bytes
SHA-256: 8ed463ab8353bf7e44ebe327bc56d7601a584419c51c84b7f3d7507979992d21
font_01_sfnt_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 18636 bytes
SHA-256: 4bf5fffec503a33215b9ee4f24977c4cee40290ed683f4dc2e16b7aee4bf8317