Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb45edc246744b1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 19:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1db8cccddd4ae22f2b2ee69ce0cf3951 SHA-1: d4e32a4469ba16bf476715e9a8df2c0d62925aad SHA-256: 3fb45edc246744b17a945e654ac9c81fef7f238c65a0710286acb85eacf5bb44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+to+hide+instagram+app+in+redmi PDF link annotation
    • http://levant-tekstil.com/other_files/File/besej.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/tewagakewepovububezanav.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/dilugig.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/magev.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/gazejatamuverata.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/jifiwedalirekumuwipoma.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ej5k3cede6ln3acs8qm76vgcu4/9179551284.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54442506123.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zorevijidokaxovemejasugab.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/xiruximobus.pdfIn PDF document text
    • https://tadimtursu.com/image/files/46076117798.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/88579513787.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/pobogoxefuturojiwidexagif.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/fawuputomirotefagujut.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/mijeramoxepe.pdfIn PDF document text
    • https://ms02bet.com/contents/files/67830363269.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/vubupadikukunogi.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/44603305959.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/8652630654.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/95336259456.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/rasibolexonebivukowovimi.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/74183343567.pdfIn PDF document text
    • http://kyea.org/imageuploads/45341697019.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/65217912248.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/75850719602.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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 18368 bytes
SHA-256: e40a794a023b8bd994093f1ed9c9a53130f0c5ffe62079f4f2032eadf2bf69d3
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 10868 bytes
SHA-256: 820b49cd43528f59ab1511a50ff0c3af965d2161c221aff6089bfe5ca7da747c