Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea75145a4648a9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 20:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06fedb9932231193772fab0d82ac1138 SHA-1: 78745f2e80464b5cd6f618f3f6d9c9753fee471b SHA-256: b4ea75145a4648a956445cfda1f5ab4b6c14c905918e95decd4e5d74d50e952e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=install+android+auto+on+tablet PDF link annotation
    • https://cheesykeju.com/contents/files/76376426856.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/fadozoselopig.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/bibasot.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/vinaxelosiras.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf1033910---sajedefab.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dutatixok.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/janorupafuwizuxewogolus.pdfIn PDF document text
    • http://195exim.com/datas/files/21996515743.pdfIn PDF document text
    • http://vpsystem.com/files/fck/29712604411.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/lawomawotezorusavizatim.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/jerasajajawepadejufeda.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/51930926949.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/zibenamijubulebejevivagaj.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/57724167268.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/padodipisevexadedonav.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161363b4d1601e---wudowibosikibeze.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63520331492.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/jagokigevududafevavakevum.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/76587394769.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/51509114480.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/56972011241.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 17956 bytes
SHA-256: ce8b7e6964bea9b489b05cb62a4ed789671c0074644be7a259e1abc1a49c4c91
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 10432 bytes
SHA-256: 5eee513defb44066000b82a47545be4b222cd312854d3ed9ea50b2c22982a181

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