Malicious PDF — malware analysis report

Static analysis result for SHA-256 9421828319b16b93…

MALICIOUS

PDF

92.8 KB Created: 2021-09-19 13:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f56bbb8475917c93bf20b59224190e5 SHA-1: 9d03df1cefdf3b41f1b698897db8434cf51abe6c SHA-256: 9421828319b16b93fe32e881d203715015bdc9581a9b670076dfe6cdb859bee7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://allytemp.ru/uplcv?utm_term=the+legend+of+korra+season+1+online PDF link annotation
    • http://anipetkingdom.com/webroot/img/files/rajumu.pdfIn PDF document text
    • https://digireg.at/upload/64046089343.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/fanofawi.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/mazivogupepimex.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/sijuberuwobujinubimexu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/bff1aceeeee5c4f43b8dcc8ab36028af/70245195596.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613348659eb44---tomuteven.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/91746497816.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/71754352576.pdfIn PDF document text
    • http://cwesp.biz/upload/file/wekukijuvuxotatozewixifev.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/22081238723.pdfIn PDF document text
    • https://kueapem.com/contents/files/ranerawa.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/25506613703.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/66998906035.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xoxijakog.pdfIn PDF document text
    • http://yilip.net/userData/board/file/xafenum.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/39288253689.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/duridepikigopunujixem.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/xepiwesabiruretebevuse.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/budadopufapolijakumijowo.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/jigusefojalelezanomo.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/bejoputerizirej.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109010314533854.pdfIn PDF document text
    • http://clingac.com/d/files/wudolo.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/88847059353.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/34993297655.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/5045965429.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_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 17692 bytes
SHA-256: a864cbd9656e6c27c1be0deb6cfd0fbd9e78d392491cbbce085da085edf63137
font_01_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 10640 bytes
SHA-256: 605c581b8c206ef4d1d56730f2ffe16a109cecdbaf65130d102b1619f31fbeb5
font_02_sfnt_off00014cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1