Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21eeeaa46408819…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 23:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f9d59848069c1e7f4d3b6460d124d68 SHA-1: c0c244b9091967060a449a86d80e3ac6d966fd41 SHA-256: c21eeeaa46408819b35560eb0b56b7e4f5c9a284735ed03cff9e22d6670ba471
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obscure the final destination or distribute payloads through multiple compromised sites. The presence of embedded JavaScript and numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bmo-agencement.fr/ckfinder/userfiles/files/finivejewejojujowufe.pdf In PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/zetizoluzubifebita.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/81082817127.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/86299207586.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9615419484.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905013729.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/94762685056.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/voxag.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0386647f3---96367752630.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/52745336524.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/bekezutetive.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/41847997758.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/sofagujamopojabefusubeva.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/fukamaxapepekokajon.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/joserinoponamunapal.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/wagul.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/35120528779.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/konelisenuk.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/47342606856.pdfIn PDF document text
    • https://angem.fr/userfiles/file/xugivebojonaperarovi.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/24225250487.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/vifixife.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/toxukazizaros.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/11778203083.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69582864219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=logo+design+premium+apkPDF link annotation
    • 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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 17696 bytes
SHA-256: a0bb674732ee54a81765d12264cd0aeadbeb9d0ac7296a4c112e602fd087840b
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 10740 bytes
SHA-256: 04cffed1974c0f2d28af92d76f5c2fdac44c331ea1cd9cb365ee500ae57734b3