Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09780b20c4dd9b3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 07:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd798700baba8729a9644b0e6650b3a4 SHA-1: 838b164ce6f7b8233588bac8438ec4b5ace35292 SHA-256: f09780b20c4dd9b3512cc6ceeb5fd51b829c3c2e3138dc9b39c9105d90cfdefc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, containing numerous external URIs pointing to various PDF files. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=julie+pallant+spss+pdf PDF link annotation
    • http://intproplaw.com/admin/uploads/file/zotefapotuwarizixusizom.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/27853897687.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/94506508938.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/63113156920.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/xumutuforefogulezam.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/dilusamixere.pdfIn PDF document text
    • https://resicolor.com/upload/files/94821956276.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/94719250181.pdfIn PDF document text
    • https://chineseclothingonline.com/File/73659334357.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/10692503712.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/xigonorunabiravujaxuwa.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/wemixitekilegumifosa.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/rikapofutapopanetogurisop.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/48034752510.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/73890117137.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/17702536806.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lawetonimavofojojebonov.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/48090074982.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/pilodadaganu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161452fca3c28e---78393138454.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/nudavolox.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/78506848160.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/rakevoguxabudipisovodi.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/nijukovufeweto.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/ximosanevegixo.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_off0000b2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A7 17304 bytes
SHA-256: 1970eb1f8e6b6d259aa7a4efcd057637791f6098c54595146f745b93c3186412
font_01_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10364 bytes
SHA-256: 74cdeb47dc41e974d20e2933b985a3f1367a95a5f7893fffca06f296b490feeb