Malicious PDF — malware analysis report

Static analysis result for SHA-256 3084861ad39625c3…

MALICIOUS

PDF

74.3 KB Created: 2021-10-03 17:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ef6a7b06f62408748d61ead5433a851 SHA-1: 70373f1410f15f4cadadab012940a8027bd0ec3b SHA-256: 3084861ad39625c34ac81c800228cd12de93e9178b05d1c6bbf34e8c1156d16b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF structure and the presence of external URIs strongly suggest it's designed to redirect users to potentially harmful websites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=best+japanese+action+movies+2018 PDF link annotation
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/55035244641.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/xajesipu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109171257588269.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/77688560973.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/fuvetax.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/69724824832.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/95416772865.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/makavexek.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/63015738962.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/81047051904.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/21583936767.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/milililiwi.pdfIn PDF document text
    • http://tdbm.vn/upload/files/surefefuk.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/54730689859.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/majetivomotivotowajagoda.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11026027266.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0ocrb5gupakrskai3u1kndesn/jukeropa.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/73219475845.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/1194721896.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/44513440044.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/38382787954.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/kapisir.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wugubotolagamaduporu.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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 11140 bytes
SHA-256: 848b5350ea42790b13da2bb306db5a3f09aab7c3fe25b9e30149c31b845f2830
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 17592 bytes
SHA-256: c5ca2424f80af0a3aa8ba4eab28d06f3a3ff3440ed0f8a9f45478d6a0e8cf8a9