Malicious PDF — malware analysis report

Static analysis result for SHA-256 992670e805ca283c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 04:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d3cc4d8a0653aed7eb3d24073b056e2 SHA-1: 35c1c8d89b070f66de22e8f4af01673059045813 SHA-256: 992670e805ca283c4db973cb90cc53bfcf150e7dc3e806f69d3c34c5d19bf4b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://thefertilizerproductionline.com/d/files/timefobidaveful.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2158a757---nuwenuridaxuvune.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35354333438.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/55128327782.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/29297054958.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/kavazif.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/vumoduvemerujew.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/xutasomowowu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/tatomuwewazuremurirerig.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109070524495930139i8njguhp40s.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/gokekuzujukudamevite.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/78672511993.pdfIn PDF document text
    • http://innotack.com/userfiles/files/66674948381.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/27445319631.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/55935415469.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109120811314555.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/98270740459.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/10236400510.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/mopabugepisujomedezizil.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/xedupodixoporakasefiwunal.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/setaxuxarozixibazarivurel.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/kazaxajazepiguf.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/43927179286.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/votamuxib.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/49151327451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+game+hello+guest+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/39607689213.pdfIn PDF document text
    • 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_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 10884 bytes
SHA-256: eab1ff1c90249d198a9eb5c3f41dcd5e662076a0bf971878e05f73d900a57a03
font_01_sfnt_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 14976 bytes
SHA-256: e8bdb4d2c87099cead25c153949bb57dda65b1e307b1cc21252d1587508f7016
font_02_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1