Malicious PDF — malware analysis report

Static analysis result for SHA-256 6165a7430602ba8f…

MALICIOUS

PDF

93.8 KB Created: 2021-09-12 15:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0575b7ad42d65df11962af88aeafb67e SHA-1: c5cd6767e02d9c28563e3ad1db948143835af879 SHA-256: 6165a7430602ba8fc5ddc33f7f9132796b0047fe97807c82718b1cb86f4fefb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://mercuresamuichaweng.com/admin/file/nidakewobulisibako.pdf In PDF document text
    • http://ebiocell.com/uploadfile/file///2021090823573476.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/fopita.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/xedogewatawiri.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/zaremoxapamopoxokize.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da426b9ce---74023796618.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/6831635060.pdfIn PDF document text
    • http://chpcentre.com/files/file/doragumekudi.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/1626329206.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/35016796412.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/33081098078.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/rediwuxomodut.pdfIn PDF document text
    • http://indel.sk/userfiles/file/34561123221.pdfIn PDF document text
    • http://vodnik48.ru/content/file/24121249949.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/mosoxopapovel.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/xalirudigumotenazu.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/40705486721.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sivupopubimawujoforunezuw.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/83140846274.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/19823880136.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/58995240422.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/67767543206.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109010015592189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chal+mera+putt+online+movie+freePDF 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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 17668 bytes
SHA-256: df8a6c118c6fab23eaf3effec2fbb26fdd55c5354e8056a3936d68970217af36
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 10652 bytes
SHA-256: 7f0080ad76d44689b355c46e56180d4297ac4b65080aab7d6e09a1c3dd6a80e2
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 18092 bytes
SHA-256: 1e5459f32f25f3c18161412cce87afb977038c378c7e19356643979a07940041
font_03_sfnt_off00015145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1