Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96739dbfb9ac750…

MALICIOUS

PDF

89.0 KB Created: 2021-09-18 23:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 250332e24bae6bc3df293302d69f0c9b SHA-1: 75e26e59e94f5fe6fb8591b61b332759e4de85f9 SHA-256: a96739dbfb9ac7503d0caa26365217e4372231f2c42eada86fa21900f4d15abd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=real+robux+codes+2021 PDF link annotation
    • http://pcserviszlin.cz/ckfinder/userfiles/files/zixowaromewezumipad.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e1728ba5---56843826912.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/28405542985.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/62417861674.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/jomuwejibetoxaso.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/movepavafomezagugi.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/33641560405.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/pubatiw.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/89499210591.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/61786040531.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/derepugovol.pdfIn PDF document text
    • https://ckmandarin.com/uploads/nebumiluxozatasevarige.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/wavapakipol.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nikusi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/niwububorososevunobodorof.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/31254200478.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/xadilab.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/49606293585.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gidenufiw.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/70986084961.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/32284297995.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/nawabov.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/givikemebovik.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/88968628559.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/14982699015.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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 10748 bytes
SHA-256: 0814adb210dcad1a890c1be45a69ebadbfaca256916f1dffc068731f5eda9643
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 19112 bytes
SHA-256: 5f3a596a8db1291ce08e607690df6bfb39b0451e09e98faab29314f16a8c4e8b

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