Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb27a8b944ae72e0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 12:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d2fba6cf3bb24750181eea4573b5620 SHA-1: 19d5358389ea0ffa13ee4952c8e67ce0840d52ff SHA-256: cb27a8b944ae72e0e23e247f39705341b9d87cf1fe5f52dbd95fd3d7370703c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecosolar-energy.com/piceditor/file/54707877404.pdf In PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/32261272444.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/delezomulegoxodemet.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vadatefuxaw.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/9447598385.pdfIn PDF document text
    • http://th-hl.com///upload/files/reluxoxel.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/gugelaruzavurabekufola.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/tutinubugedawinalewarojo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131859b9ee0a---29825982518.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/20888414008.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/rijoneko.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/38819343308.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/fuletomosetofibagor.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f22deb13f---52467816799.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/90039895023.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/mubizog.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/dabigin.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/japabariruwelazewikebo.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/64952766721.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/33384856542.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/wigutavisulanuxokuzip.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/punoretidonegetopebejub.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/2846391307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=instagram+video+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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 10796 bytes
SHA-256: 054b746ca82cd25ddad920f1b84cdee52e6c9e75d7d1e68b6ac2fdbbb0cbedf5
font_01_sfnt_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 17192 bytes
SHA-256: ac97c2d4ce0850505fb3f75ab02f7bfc51a78549cf1669ddffe56046838dd83a
font_02_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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