Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8b66d749d30200…

MALICIOUS

PDF

93.4 KB Created: 2021-10-09 05:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33554f45650f595b8b1cf30a322e72e0 SHA-1: 9b288e893cb2ec717784d040211efb5fb78d3305 SHA-256: 9b8b66d749d30200d90cfa503a6ba065ed3586b6bd4adcc7e739356b8244b58f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF format and embedded URLs are commonly used for initial access via spearphishing attachments.

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://wastran.ru/uplcv?utm_term=travis+in+my+white+tee PDF link annotation
    • https://fcimoveis.com/imgs/file/76715929995.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/76695291234.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210904120658.pdfIn PDF document text
    • https://gilbertems.com/videos/file/622894745.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/kawelisakosilozapobakoji.pdfIn PDF document text
    • http://innotack.com/userfiles/files/lodugafewofawuno.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/21170002074.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16231728443.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426e021ac02---76211002311.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/40294985796.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/12294656354.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/fupilefewazadedirevofilun.pdfIn PDF document text
    • http://geoman.cz/data/file/luvezejedipudevulasel.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/79226445954.pdfIn PDF document text
    • http://holztreppe.pl/userfiles/file/98852547915.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/20723194041.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/31873690753.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/bozolasiwetegozeju.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/mufixa.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/95532942603.pdfIn PDF document text
    • http://ipllaser.in/uploads/nozojiferekafupefopopobuj.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dibojuzatazigogi.pdfIn PDF document text
    • http://slsnn.ru/content/file/82640036698.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/20661302281.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/zibir.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_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 18968 bytes
SHA-256: 8f82ff8020858996d86dcdf6a07aa423d85a786eb8eff455efe18954e5c09628
font_02_sfnt_off0001509e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509E 10436 bytes
SHA-256: 489810670ae16d7b0e4556e1e78692057eefa7e225e413d0a06fed3060963c70

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