Malicious PDF — malware analysis report

Static analysis result for SHA-256 841b4d1f00a55694…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 20:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41a86bc7d115f05561557c622ec3a0b3 SHA-1: e973b5bbe0337db113e271202054f3650cb74146 SHA-256: 841b4d1f00a5569423c671fa6873f5cca9af50989c422f55fcca7160c63d577b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded URIs suggest it is used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nomylo.ru/uplcv?utm_term=name+some+insects PDF link annotation
    • https://yam-token.com/business_school/uploads/file/nedetubax.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/vetenapenagabomuji.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_A6DFA9EFA8EEFA37.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/76050292535.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/petuxami.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/gaxokubiligomomeponez.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210904_091754.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/71344881592.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/97481389799.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xezelesolonagifip.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nuzajifonopidunixovonuw.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac55bbff7---zejunutuseliloloxuguza.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/fijoresaxagigoreduw.pdfIn PDF document text
    • http://heizler.hu/files/file/riluwasavonikuw.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/dekimoxadolebumefolil.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/walibulovoduzipom.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/lesag.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/83058052156.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pojavolomunasuv.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/19256237068.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/62037664224.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/riwoxudivobiwowedo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132299c78af7---xajajumakizowo.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 17844 bytes
SHA-256: 8676a7346cf40fdaa6e9052a3fd6ec83f7eec87dbf85be082b9c6649e57e7a5e
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 10224 bytes
SHA-256: 177137b26263681a2c4c639465309fe61c6d8e5c34af9a437af4b33b3deb0f42

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