Malicious PDF — malware analysis report

Static analysis result for SHA-256 6454af4460370cfe…

MALICIOUS

PDF

71.7 KB Created: 2021-09-22 09:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3cd4e743bf900866c2df28ac5aacb52 SHA-1: 2f9fdce94a55876ea871a738968c34b8a30a5a72 SHA-256: 6454af4460370cfe000bef2f5f1ab0e5187cd53d279585b94f68039ca51de049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many with 'utm_term' parameters suggesting tracking or phishing, points towards a lure to download applications. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=ntsa+app+download+for+android PDF link annotation
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/11058237067.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/44627776113.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/94001337549.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/70779988479.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/78573063854.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/67734812407.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/tilusolik.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/bilim.pdfIn PDF document text
    • http://kftchem.com/upload/files/nojoxojofokod.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/64104348338.pdfIn PDF document text
    • https://conrays.ru/f/data/dejububopekukor.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/71982875297.pdfIn PDF document text
    • http://pasted-radio.de/web/files/47592464743.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac9e4cdaaa---82333620611.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/loxenabanezufofobadizamo.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/2246503971.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/57357712948.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/13954063106.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/39209971630.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a941dd6e5dbf75d063085996f8bd3858/28585637899.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/95909027499.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/95722788445.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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 10420 bytes
SHA-256: 81835282b7be15da3baac03ebd39ce8cbb7569d6edfca7ad5e5f7c569626f75c
font_02_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16288 bytes
SHA-256: f4083d68f4827f0400101cb5f1581e31f25bdd7913c72861aab3412ca6259113

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