Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40d403aee4ff6c0…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 08:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ab6b1ead9f173bb8e9b632e03b533e1 SHA-1: f367e64362ddfcc0d12ad11dec7f02557471a94c SHA-256: c40d403aee4ff6c0582358cfb0d72328009f186dcf82dd08f1ad577863f4c62b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links as legitimate resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=america%27s+history+henretta+9th+edition+pdf PDF link annotation
    • http://gabinetortodontyczny.eu/userfiles/file/gopepudularume.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/21766618877.pdfIn PDF document text
    • http://twilaw.com/files/files/84551956911.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210918_065520.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613661eec4089---32829215213.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/33793610113.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/degez.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/16689065024.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/pujogexesakawimakuturow.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/13356291144.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tufamigopurerazovezutorof.pdfIn PDF document text
    • https://x-software.cz/data/file/wiroludujapubilig.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/repapetagedugob.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42399299067.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadavipajubobupixo.pdfIn PDF document text
    • http://allycatering.com/userfiles/55100388329.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/64772451067.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/96023909491.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5c6e91db8---zopubewix.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210904_231932.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_off0000bb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4D 18708 bytes
SHA-256: 639e07eaebe98a5fd81b71b525d45f16e7955a19c6f2b0e90fe0b82c21b43838
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11136 bytes
SHA-256: d7466d0fa0d2dc782ff72565902d9a47200eaea0dfd632e6b55ec71a524c4434

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