Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47c08793154250b…

MALICIOUS

PDF

86.5 KB Created: 2021-10-11 06:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b906fb6c2aedfdff743195b395b479a SHA-1: 2179dbca1e39a883aa88b68fbb95cd912fb6be48 SHA-256: d47c08793154250bc625d6b4a968fe9e479dcaa2e806b4c9b173bd3e91e70d14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. ClamAV detection and ML classification further confirm its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=studio+c+dungeons+and+dragons PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148caa3c06b8---xanunev.pdfIn PDF document text
    • http://yongqingtech.com/d/files/gerezuvenaveginajakuvune.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/faxir.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/vunubesijanunarelebenomo.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fupetegosefitow.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/pakepa.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/93654582883.pdfIn PDF document text
    • http://canadanur.com/resimler/files/tudexajopetozupaxe.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/18720568992.pdfIn PDF document text
    • http://gojjang.com/uploads/files/49483654826.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/juxotojunovidugofepufe.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aa9ls09fng36l07h8qh7b7m94t/90872998758.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/78253457468.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/23303584334.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/musadi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/jozobe.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/ginisisuzofozob.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/87894580540.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/99069873601.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20211001035823.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wewilevaxe.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sojupesubezitanapejutosef.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/25038498146.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/tetadikiwowazaduforofuk.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/64254549256.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_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 10672 bytes
SHA-256: 1666880f43a5b0f43e79e24955cb7dc1563ab5648a56429dd120365b889ccd10
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 18932 bytes
SHA-256: 482c6a85656cbff5e816bbe46db59c204db4a0621608c0d3af50a81a32e21115
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1