Malicious PDF — malware analysis report

Static analysis result for SHA-256 6554d7ba3c5d3709…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 08:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a064b171c058ec4ca2aa8289b04cb85f SHA-1: 33c72253466533802cc755cef6104c7579373594 SHA-256: 6554d7ba3c5d3709cff056b09baa7960c19142246338165193d25565768ba7f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs that redirect to disposable hosting. The PDF document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=word+with+x+and+v
    • http://seksdagen.nl/userfiles/file/tobidonenifojux.pdf
    • http://cftckr.marketsearching.com/upload/files/zilinuzepivijetadagiba.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109051158199820.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161442b6ad53d6---reximifenizat.pdf
    • http://metabolitplus.ru/files/file/68230947780.pdf
    • https://advantage.ee/media/contents/file/71266424081.pdf
    • http://thegoshow.net/userfiles/file/99603488843.pdf
    • http://4reality.cz/userfiles/files/82618174754.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b161e51d---18645315312.pdf
    • http://demenagements-remond.fr/userfiles/file/20210904150446.pdf
    • https://nasco-ye.com/uploads/file/61724814295.pdf
    • https://servicepapik.ro/files/berosatoxexedu.pdf
    • https://7mark3t2-7aya.com/contents/files/buwusizuvuzalirubivibi.pdf
    • http://coinproject.com/userfiles/image/file/rivekapovefujone.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/68550665573.pdf
    • https://lordoptika.hu/files/files/78372167559.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/gidonitagamepisivu.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/39770022446.pdf
    • https://kuraniterbiye.com/resimler/files/40723027059.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390681b0291---5806259572.pdf
    • https://maviet.vn/upload/files/lamifosisine.pdf
    • https://mobilaide.com/upload/editor/file/wejedemuwef.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/39298721985.pdf
    • http://refinerlink.com/userfiles/file/nomexokimivugalow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 16792 bytes
font_01_sfnt_off0000d4b4.bin
3194dfc8a2f2508b10dc6a2924707cfb6e8fa07d4fcb49cd34f2c6a2a1db8372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 10248 bytes
font_02_sfnt_off0000ebad.bin
40ffeb57377b0651294ef0793e596fbce9546c767cba8bb26e86dc787c3d4cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 18280 bytes

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