Malicious PDF — malware analysis report

Static analysis result for SHA-256 936cc708e874412a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 03:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6cd815bfe4c93c6f514e5bb6b503d71 SHA-1: f3ccfb88ef3fc9f7f4d7b565f33595f0c2257c04 SHA-256: 936cc708e874412a2e001b829450a5ccf9675ca19dea87146c8aec22653a05ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is used to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=quantitative+aptitude+by+rs+agarwal+pdf+download PDF link annotation
    • http://cga82.com/admin/File/jiwokumubewiribekusaxo.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/wonesewagaruvodipugoko.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/25294074621.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/segarasimedilofafo.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210904112651.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/25848383537.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/53493676488.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/jozanobeke.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/98744561258.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210910_231350.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/tawarapaguguxoxirazo.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/60541994849.pdfIn PDF document text
    • http://canadianrockies.info/files/file/delemu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54232564884.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/jixovimatizix.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/tojewoju.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/xenilolamirizutiri.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/nawulexotojozej.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/sodokube.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/bezururebutom.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/memusujuf.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/lapuses.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/57808383242.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/36911374426.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_off0000b1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 11236 bytes
SHA-256: e792f8fd3c3ed672e8a5f9dbe35eb6e0c87843cf3d2f98406dece0d3388adf1f
font_02_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16352 bytes
SHA-256: 850cc3e6164faaf0fd47b974d70e3ab04eedcdd173afb5d9cc2abcca479aa3b5

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