Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed51c97afc6b095…

MALICIOUS

PDF

88.7 KB Created: 2021-09-09 13:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3749de4c0739babc38aa633f15ef4991 SHA-1: 815b635f7650324dad08e257c7be38e7f7fa7287 SHA-256: bed51c97afc6b09506415b732025c59a7542273df8fba642f3a35e4ef7e4fda5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613932dda8b1f---mowesa.pdf In PDF document text
    • https://pensiuneaselina.ro/userfiles/file/319474817.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/robekasosaxenigor.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/pasagosida.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/letejiwanomanevajuro.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/reruritili.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/zidotasofe.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tebuzufeni.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/77519471948.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/gavutakuraf.pdfIn PDF document text
    • https://sanagustin.cl/files/faxutokidorevuragefat.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/53893017413.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/ralexexixuni.pdfIn PDF document text
    • http://schubert-hh.de/image/file/dawevumomadekaxuvu.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/89401868163.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/sigevagudi.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/11535466417.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/80958388067.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/25960923318.pdfIn PDF document text
    • http://geasit.it/userfiles/files/divinadisotasevo.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/joxovibujud.pdfIn PDF document text
    • https://apra.pl/files/file/72186566147.pdfIn PDF document text
    • http://all-premium.com/user_file/files/gexexupixod.pdfIn PDF document text
    • https://wittnebel.dk/file/jidakovifasapemefidebeji.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903202655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+unlock+android+phone+forgot+patternPDF 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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 17916 bytes
SHA-256: d88eb4bd77d993b94f3a0a80ee3d25e48b732e1fbc3dca49ff68b5fb47ef8592
font_02_sfnt_off00013b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B62 11000 bytes
SHA-256: a1aaca50301f5dcedbb0b762cdec8f79e7110b3be811fddcdafe5ee87931fa4b