Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5459eb864b90f7c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 17:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e5d27776d19a805ed5313ba7a67b6b39 SHA-1: 5f306c943022196c0eae78e2e896b2eff2930a43 SHA-256: a5459eb864b90f7cce257b1f908db4c4c9d352706e674e89bb28b0b4ae8dfbda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=god+of+war+android+apk PDF link annotation
    • http://atrsara.ir/resource/files/18202922329.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/31127927119.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/xarov.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tisuvuxawobodenitomu.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/18198074557.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/wosenuxijowutujun.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zefuwesowadifapepigugejok.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/jevixuk.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/78859200142.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/pipoba.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109110642495657.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/lanugerapokigat.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/kenarori.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gipusuzulamijopukini.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/55598021578.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vemulevezuruzikegezumamaf.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/43631990955.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/98879964354.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/siwogobire.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/filapozizozo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3350c3060---gulilar.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/furejasala.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lotosijepoteta.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2340924990.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210915174612_0eofx0.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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10264 bytes
SHA-256: bb2789370179394c4451d51e8758b83ea16e1cbab1a2a4bbfbbd41826f2e79ad
font_02_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 17880 bytes
SHA-256: 85f8b6f6ecfc07fbb37d2b96a18996711528ee9473cfec5c7d0b6d6732bdc409