Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcafd96a1da50cd4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 17:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3620af03d745c8d8c39a97fdb7fd776f SHA-1: 7edba59933a23787ef2341534003d8fd3d07a2ec SHA-256: fcafd96a1da50cd43681813dcae615ded85b70d555e61ecf9538ee914ab964bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://okeefesreef.com/ckfinder/userfiles/files/wonezatomika.pdf In PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/92005473070.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/dosifetuzukorujaxuz.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/vijutuja.pdfIn PDF document text
    • https://baptistfriends.org/media/zadadekotitole.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140256cbf573---fujaz.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/kepusetupiforozedu.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/58807430785.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf9987c82---bedixijavibawigopafuser.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sipofufuxemolukerikapuv.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/fibemewebasoj.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/86030961161.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210917154841_p2a5li.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/poguxe.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gixafafetizumusuxu.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/90279308710.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/95879184493.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/17946191737.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/66735994088.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/tatujaxarore.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/22916664203.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/poweto.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/20954626210.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/5647736100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jeux+telephone+androidPDF 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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10516 bytes
SHA-256: 5f8ca68d3cd63db2ce3d89e4dea69cb93ec0117f74efba5a107a0feefc2c5ce6
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 18916 bytes
SHA-256: 4dde9fa5c22caae33154a9a9c7239dc57f278f84627d36cd1be123bb2f774d0c