Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec33847fc747207d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c14beda1da9280d1d2055dc3a1c63915 SHA-1: ac04e4898fb51da3841ad4fe397d328a61ec442e SHA-256: ec33847fc747207d8c5b127713b5957e893cd74e8aa808bd40ab81c149721450
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. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fitsiluet.cz/data/file/zoxikofifeduperomapebim.pdf In PDF document text
    • http://nilesk.com/userfiles/file/gokasupi.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wurogaguzobo.pdfIn PDF document text
    • http://twilaw.com/files/files/68860120280.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/dozomafixuxuzuvote.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kizoz.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/biretexunaw.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/82f31e1218f780cd67b62cfbf5bbfd5c/68495113420.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/zituxukinitumuxefadenuda.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/javalutexurus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a14cea327---28250238686.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/53093351910.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631284364203ab869723a40f7e.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/sasasetime.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/zibedumilijuvuru.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/kulojedejejonedonuzopazis.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/66866815744.pdfIn PDF document text
    • https://toocapen.com/files/suvuwowekizit.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/xukejesawixo.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/lisikasuzemanelififitol.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xafifotuzavog.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909113604148297.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/zubabotipob.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/92752326051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=and+the+chocolate+factory+full+moviePDF 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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 10832 bytes
SHA-256: 14dbadf488f42340e897a4ece88444a71f9f8923193b0ebd0af7d9c8cd36ec52
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 17308 bytes
SHA-256: ae006cac9ad9de591768b6e2d6348953cfc434e3ea3e57dc561dbb42dea8208a