Malicious PDF — malware analysis report

Static analysis result for SHA-256 9005c386aef74474…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 13:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 707e5983539215d8f712a499c2b4df5e SHA-1: 290c485292e489d0d1cbc60b4d152f1b21b6009f SHA-256: 9005c386aef7447472552acb40e5d92a005c0e2ff6349633e01c5895305a097b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=cricket+games+not+available+in+play+store PDF link annotation
    • http://buydecor.ru/uploads/files/54642102749.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/87732746565.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/78071088542.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/49813115972.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/sifewezelopigugamowaboken.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/20721528763.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/xigegimi.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/muleko.pdfIn PDF document text
    • http://idcla.net/upload/files/94575100361.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8ded4e4598d35b15e0fbe223e37cce36/wofumepixajifewaparir.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/fitezogojotig.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/sulogi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb5360f0fc---paxonolezerisuvi.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109011120387859.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/51490734022.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/pozok.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/warefogurisubo.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jumemusiwuwafekituvifunux.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/bixememomaraxosedifidub.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91992373619.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/31111630625.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/bujama.pdfIn PDF document text
    • https://htchninc.com/d/files/jiwabasawidukubaleg.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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 17044 bytes
SHA-256: a011efa60cde8f264df032a6276c305104da3f35ffbf8fb4a450f52687c5f74d
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 11160 bytes
SHA-256: f07a54023455917b39fa6ba8db148e77061f2062db780fc36d26856d9ed3228e
font_02_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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