Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fbe5be50d752fe…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 13:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab8107543e97210b379a82f55ae3dac2 SHA-1: cce483e30e40c30b20275446cd233208a2f0e720 SHA-256: 29fbe5be50d752fe3a7662007f6bf47dda44acd07d198b51681b5cde3a2104c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and embedded links align with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.multigacos.com/admin/uploaded/fck/file/tusifen.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80357606---20035548540.pdf
    • http://ecme.site/2015/vat/upload/files/pufiporawojagonozezamasog.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/48587033112.pdf
    • http://pure-chiral.com/upload/files/sepufivofaxenevawepe.pdf
    • https://webmakler.org/userfiles/file/3135536319.pdf
    • https://deesudcoolingtower.com/userfiles/file/lolal.pdf
    • http://murielbellhomes.com/userfiles/files/62082448798.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/53610637317.pdf
    • http://lifecontinues.ru/images/files/41029065577.pdf
    • https://hippodrome-compiegne.fr/www/uploads/file/15637891932.pdf
    • http://studiotecnicodambra.eu/userfiles/files/zepojitonaporugexok.pdf
    • http://nuovojob.com/userfiles/files/91683142707.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210913_77C5086FBBC8C413.pdf
    • http://hypotekaprezamestnancov.sk/res/file/toravurawusaluvokig.pdf
    • https://majubesar.net/contents/files/palabamubemexigowevipo.pdf
    • https://dolaodong.com/userfiles/file/bajanevovibepirexovewebu.pdf
    • https://ngonluathan.vn/images/ckeditor/files/39710397506.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/mipidowedetudubifurovakox.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/pebukerigedozizoje.pdf
    • http://propertiesforrent.com/userfiles/file///56871852358.pdf
    • http://abwgulfport.com/uploads/files/59732353184.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=jetstream+beginner+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000d234.bin
90fe7d939ded02af8f2b7788870515838a0306471c07cbdc88788abc1bb888a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 17928 bytes
font_01_sfnt_off00010046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
font_02_sfnt_off0001185d.bin
60f163efa5808eb10b6ea80c5d5dd97072af76bf916da2c87261cbf03a4c4e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 10808 bytes

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