Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d1c87e4ffebcb…

MALICIOUS

PDF

90.8 KB Created: 2021-09-10 01:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21ce97baefbe1a3fb494a88040b7766f SHA-1: ec7fc45bd8101940f1bae10a9ed1411666ae1724 SHA-256: 231d1c87e4ffebcb37f4200a4e1a26e673d8598c38a5f06c4eaef3bd8c59ed13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=bug+miui+12+redmi+note+8 PDF link annotation
    • http://rcp-ranstadt.us/files/sesuzazixazetamifabi.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/69937949159.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_052139.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/ninatemifog.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f5380a43de48b6b91b447ba69bd8b382/98619334561.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10165009610.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jopilufixewufumejo.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/90748679980.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/koxogekejuluravovop.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/xoselesiminilanefakugepa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/napefabizugilasigasu.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/60462539527.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/8516209549.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/sopesamaxafodamotu.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zototefibedinag.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judid.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/56128680022.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/59935303673.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rrdfc3db6ot20c468qvd1q87s9/ximikebujive.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/76596847350.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/50574057573.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/wavalalejikabepurugu.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/67616457867.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/16181136664.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/6010911516.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/81018715783.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_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 10748 bytes
SHA-256: 32dd24f5db64285efa6b8277919e761dbd221e81290fd3e7b495faf458fa8b17
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 18708 bytes
SHA-256: f4ee8b305b2d074b658e7bae4a36e23adce08d42b5e5407ffc27bfd18cb80b49