Malicious PDF — malware analysis report

Static analysis result for SHA-256 2785a3fbff95679b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 19:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d0c55a64233f9a3540d4f1628aef177 SHA-1: baaf2d00868cb86577527b0a38b6093d64a0a9ab SHA-256: 2785a3fbff95679bde9e46565cc05fcf45d6b59033a8ea5cf0d80426bede996c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a phishing site, as suggested by the numerous unknown reputation URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mimzyonline.com/userfiles/file/xosojojuwezarusokeb.pdf In PDF document text
    • http://garage-fuji.jp/js/upload/files/63437998844.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/ritepanufaximi.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/moridis.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/41752508407.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fefulamedozizolovokomolu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/26044738736.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nerunopigilaxutifugoge.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/11524641386.pdfIn PDF document text
    • http://rcot.by/pics/files/rojoxetajunivaj.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141748107820---sirebokevigaxuwamitomu.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/32672303738.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/vevin.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/boruvezawusesoto.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/88690609483.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/96432547594.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/towibomebe.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/kimekubiweba.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ralobobarigasaki.pdfIn PDF document text
    • https://conrays.ru/f/data/28931211545.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/mibigezoxobodat.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/66047189168.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/guzal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dil+se+bandhi+ek+dor+mp4+song+download+audioPDF 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_off0000b62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 16908 bytes
SHA-256: eba70d72dd83330afd6876e7bf93c15d229d8b00a15426bae7c2199e4e795a94
font_01_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 11236 bytes
SHA-256: 56d497ff2295ce2b11c7219d59543d1d9411496e65dd565868c97837a4300aa5