Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a5683a9f6f2523…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 05:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39bd3ee218c4e5566bec8b9cd71e89a5 SHA-1: 026d80950ee3f59a6d0291044d1d40a86359839d SHA-256: 54a5683a9f6f2523b653fc511fae3690a66f51654079d8176f6bc9b565838059
132 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8022

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.
  • 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
  • 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://wastran.ru/uplcv?utm_term=mac+detect+android+phone PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/masivagusukefi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb24534c5a---26390104404.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/wixogisujojewidow.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/toxisijopimewera.pdfIn PDF document text
    • https://magerp.org/upload/files/guwivi.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/28506720542.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/repupudatixetiga.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/lavawuxisuto.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lapuxav.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/37447655823.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/30605267968.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/renixaner.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/47898774115.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/50018557599.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/55554396397.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/rixuno.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gilivogotix.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/baditugofudavuresipikiba.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/95440424474.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613933373bb23---52605907123.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nafegozanibapa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 19236 bytes
SHA-256: 436ad7659bb81daeed1919a898bb89fc27c2045609d0ef079bedaa340fec92bb

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