Malicious PDF — malware analysis report

Static analysis result for SHA-256 3479640124c24b64…

MALICIOUS

PDF

119.2 KB Created: 2021-10-11 02:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9246b4d20d90441ae40762f0c7859aa SHA-1: 49ffdafa5da6775ca4271addacde9f4c8b531e0a SHA-256: 3479640124c24b640b117a171819122a3e332981af91a23524792452fe619e76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://briljant-maleri.se/UserFiles/files/30013664544.pdf In PDF document text
    • http://selfmadefilms.nl/userfiles/files/87689430674.pdfIn PDF document text
    • http://samtekelektrik.com/files/fifan.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/47821509046.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/90193205797.pdfIn PDF document text
    • https://synersys.fr/contenu/file/18844957834.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/wamimetosamuj.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/77071f55720b7e64db1c930a4f778c12/56268038400.pdfIn PDF document text
    • http://pronobile.de/catalog/file/rasojavidexo.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/sirasubetazojomovok.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137700c0a3ad---76103111398.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/jilokivamixazudidudin.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/jujuton.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/polabavulivuponorofe.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/nodazojezosiveku.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///2221822184.pdfIn PDF document text
    • http://fpole.ru/sadm_files/kaxuverap.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/80307274955.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/gevufokik.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615b5636d5daa---dafazofemudozirelekegowe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/jixefevaluxirogi.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/54064818139.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/bomamogupimopume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=going+for+a+wee+a+lotPDF 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_off0001675c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1675C 21292 bytes
SHA-256: 643902620d8e291746e1fb81042f8e7356ef76a766d0d0f14142caec34568f18
font_01_sfnt_off00019f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F84 10348 bytes
SHA-256: 8c4966dbdada1dd336fa9805be267138bcbeb8de4c59c67739c311787eb2b08c
font_02_sfnt_off0001b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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