Malicious PDF — malware analysis report

Static analysis result for SHA-256 0994098765fe4780…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 13:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83915fcdb1e2b8b581596b1a9aaeb031 SHA-1: 7389c7f8a2f8978f01e1d056aa88cf63855d01a6 SHA-256: 0994098765fe4780798627473bb4144f7c4d83cde67095c315d33e994b0d69e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific heuristic identified it as a link farm. This suggests the PDF is designed to redirect users to potentially harmful content, such as phishing sites or malware downloads.

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 http://cesvil.it/filesUploads/file/tukadezimunetesetiw.pdf In PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wumevof.pdfIn PDF document text
    • https://kawanmto.org/contents/files/40323424530.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/77073574864.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/81218596970.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/77045968452.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/zawafasuwuwelefanobanej.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/jelixeseziruzulusuxuxol.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/15652904352.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/wixodimonunakezuz.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/21648505651.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/xifabu.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/kenidazukim.pdfIn PDF document text
    • https://jin-ji.com/upload/files/ruzedijoregova.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/bizuxusosajekiwovopule.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/37609836715.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/ruturekenudexexadunuru.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/71229285864.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34bf40e509a550ea793f2f0d317f79a9/migafokesiwujizomalufik.pdfIn PDF document text
    • http://taigesw.com/upload/files/39283201204.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/54742051815.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520b01392c---43404772408.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/susepidetilin.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/45103798653.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/34280030678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+immortal+life+of+henrietta+lacks+free+pdfPDF 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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 16644 bytes
SHA-256: 54b045a24d3a22a23d08b7da0f70b57d657df0af9ee090e41d4f57c7685cf52d
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10940 bytes
SHA-256: 2bce8c53b0e78185ddf6bbd3e1d133052c972bfcd75cbd7245b8489bc5e56570
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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