Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c48a962e9b4e3…

MALICIOUS

PDF

71.9 KB Created: 2021-10-12 00:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a845929c8b26eb55539af932de2bb3b SHA-1: 0ef426c0ebe7efa48418b24dc2181f71cab51358 SHA-256: d49c48a962e9b4e3723aa5cf5290f73623358866e8af6c413a02501a719eb809
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://susta.vn/userfiles/file/18081460899.pdf In PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20211010_8CC9CF665230D29A.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/zepepedasavawusobut.pdfIn PDF document text
    • https://viettrungson.com/media/Files/16751527862.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/ditonawironotivebanome.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20211002122421.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/75097178234.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/60649049971.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20211007045134_ivuz6g.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/92124277764.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/vonogonawusorovukepil.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/fipamuvosaxegujes.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/pobatiwefelakokodojixewut.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6smjphdthhkgfeu285me4f7am7/wafizopokugowotog.pdfIn PDF document text
    • http://ridendo.cz/files/file/fupaxefuvanafevejiz.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/30579149526.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zafivenulevomogeka.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2b5b4343---13152544711.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zededobapewovona.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/87904922706.pdfIn PDF document text
    • http://wixoon.hu/upload/file/26800795761.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/welozupu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=xt+woocommerce+variation+swatches+pro+nulledPDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 11040 bytes
SHA-256: 4dde3c3353ea8f99e915ac2e1f59dafbbaa1ba5b02cd7fb3a1a4c8b7560e54e5
font_01_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 17560 bytes
SHA-256: 7a3a2c5daba08fe5a930c0a560f2f6fa92f2110fd87e42ca480d9c315cd7cf43
font_02_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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