Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64ca544fde13fff…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 00:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ceea9ae14abfa786ff406f17f34ec850 SHA-1: 7b5d65c2d2481a7ed7bad685a45adab5751c5612 SHA-256: b64ca544fde13fff5e540079fffadcdd774e568bd346e6e28bc464559092aa56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, a common technique for executing malicious code. It also contains numerous external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://renteci.com/imagens/file/sekikejuxalezola.pdf In PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/babuf.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sezanaledopexedima.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/zozanefitaxipenabarazu.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/mikin.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/paxuzos.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13547308937.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/zenoguwiregeretikunofu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wojakovarodotipexiv.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/78781720868.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/9634583392.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910002208.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/fuxumifudujirofezaduxux.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/tolipodebenakekirizubi.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/6306611761.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lovixu.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/82134903942.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/51095861749.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/wavalobi.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/sofumixivapakonasulezoga.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/towosatovosutile.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/31b428d5b647e4d971ed843226c31215/donup.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/fugomezedanenamusemifumam.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0446139c---11308681290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+mobile+1.0+update+download+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2E 16320 bytes
SHA-256: bc6ac6e73e598537058790adccf27feef192bf84f87f540954f7eadbbe03fd65
font_01_sfnt_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 11124 bytes
SHA-256: 8d012865692ea455251d5d28f309a4d10eb19af958d27fd9b037fe867fe015ac