Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a837fc512ae5cb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 21:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8213743684a9b73989eb33a7345cc1f7 SHA-1: ee1c15f6c82cb98faf5d7957f8702d66f4561916 SHA-256: d9a837fc512ae5cb4ff5e3af0d59377c78c95d90463a280c8d73a8d66be6a19d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, including one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URI findings point towards an attempt to lure users to malicious external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=watergirl+fireboy+friv PDF link annotation
    • http://botosani.ro/img/uploads/file/nidodi.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/90321375768.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/gadap.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/19737405418.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/3327680877.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f925b9cf---mevizarosidelape.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/79499239216.pdfIn PDF document text
    • http://deltools.com/userfiles/file/63954216382.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458823b9513---jajujoxewikimuwanadipemoz.pdfIn PDF document text
    • http://rayanchem.com/d/files/nonagadadutakige.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54572644358.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/80804185458.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/xulaja.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/92019577253.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/94851187020.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fologufana.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/wiwirulovijepexawiloxad.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/zuxelewalizix.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/64642444932.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/8777293304.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/puxikuvuwiz.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/83819547327.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dojurupirirawe.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/refosekodu.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/4334059845.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/mimulejugotokofoxefa.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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 16516 bytes
SHA-256: 57041749db8563d63ad53a6d28778e788042767655634e4abda30976dd0819d2
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 10428 bytes
SHA-256: 5d068de31201129bab7b34a3de804511dfeb477556dc8e8e825fd77b21ac46cf
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1