Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ce69fe91ca8581…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 21:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d11a00eb994d8fa20ac290176fb66936 SHA-1: 5ac2f31dc7252e4d17352b01dcb864457799e738 SHA-256: 10ce69fe91ca8581e2fab3a5cb05861fe4eeb3504622a4a571599fbb798ac11b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the overall structure suggest this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=sword+art+online+19+moon+cradle+pdf PDF link annotation
    • http://aitrans.org/UploadFile/file/F1202109111753567659.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vixex.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/josafesaguruwopujofemaded.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d07006cd7---83341077543.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/momuperoveniju.pdfIn PDF document text
    • https://stvorki.ru/files/file/72782629428.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/89680399697.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/34418492101.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/somutebazaxusekapu.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/70233078743.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/91011285782.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/20379119801.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vuwemuzisofukipofodinu.pdfIn PDF document text
    • http://armanetti.com/images/56610159480.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/fugapivewawomeb.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/7304388279.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/tukinutinixoporawepezuwaw.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/11334403809.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/nubuveganabutewozoxofuru.pdfIn PDF document text
    • https://synersys.fr/contenu/file/notubagisanap.pdfIn PDF document text
    • http://qwerty.pl/_data/file/42419421618.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/16440247514.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/duwizilogimozotazilepit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 2456 bytes
SHA-256: b84ceab13736e62c7617e1c40428285d8c34a1bd37544a31429e37ba6a2febf3
font_01_sfnt_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 17524 bytes
SHA-256: 74c87a9cc0d0f5de8b9de5043f60ea91185bd88378525e0efaf8f074efb4348e
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10992 bytes
SHA-256: 023351d2d128729c30e316145c98e150ec415d02b44cad28c75db5256ae8cc59
font_03_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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