Malicious PDF — malware analysis report

Static analysis result for SHA-256 734266491a5d5197…

MALICIOUS

PDF

83.5 KB Created: 2021-10-08 16:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a227bbb597482b220db6b9ff1f84d490 SHA-1: d4613478a0cfeae688fe21fa79e211c22e46c426 SHA-256: 734266491a5d5197f596c8f75fa515f8fcb3ed4badabc221336cdb948af2b493
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious PDF files hosted on various domains, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdec31ff6f---jitadakegub.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/bodigovaxabunejig.pdfIn PDF document text
    • https://invision.buzyhub.com/files/46415894800.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/23357995810.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d66de3784---79232845040.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/nogikekovejawesixo.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20211002054625.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/midipetasap.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/13677781343.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/21389949333.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/goveguwitulotokoxidije.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/5fa293ad79a9f8ff87dc6da36dd7d3d5.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/wegoxopopabibepiwani.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xewulilixizujubij.pdfIn PDF document text
    • http://rilta.net/userfiles/files/dajidulujudujelixis.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/94577046334.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/gatelux.pdfIn PDF document text
    • http://chinazzjx.com/d/files/24999789188.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/78428865802.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/27804901808.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/10852342732.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/verigixeg.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/51660394639.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/tonexidelovixes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=outlook+password+recoveryPDF 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 20004 bytes
SHA-256: cac5496f35cd7d44630cc93b7e7b2c55ee82eb2107a14d04b5c65692c4c302b8
font_01_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 10796 bytes
SHA-256: 96c916ba638ae465441fe1abc92a3e2557303a6d0171d94cca4dfd17219e5e3c
font_02_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1