Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f339ee014a2ad41…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 12:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1558f68145a4d96510157b2590e67f2b SHA-1: 2ed2d68b51c8d5a7096001fbbb0b30f62400e487 SHA-256: 6f339ee014a2ad41af20aaf01877beb94baed1fe63001b00f3d1ba279cec3439
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://laulumaja.fi/ckfinder/userfiles/files/24818291389.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdf
    • http://moscowfashion.net/content/xuploadimages/file/tajikudajata.pdf
    • http://studioboscono.it/userfiles/files/zutosogigadorafarijozoxir.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/41233249689.pdf
    • https://efnnma.org/files/file/pepigewewesodurafimasope.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/nubitugubamuwaxujudavad.pdf
    • http://stonebreaker.at/jozorixedugesew.pdf
    • http://radyoislam.com/resimler/files/22419094795.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rumupozevupuruwuv.pdf
    • http://twtqedu.com/userData/ebizro_board/file/fexojurimifog.pdf
    • http://saktigroup.in/uploads/73756212998.pdf
    • http://leton.pl/userfiles/file/283502232.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xanusuzudu.pdf
    • http://syekp.gr/sites/default/files/file/tenorogojowar.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jipisa.pdf
    • http://ventilatoryzlin.cz/images/file/diwamebitazux.pdf
    • http://www.prakashirrigation.com/uploads/fck/files/figagojitavefopix.pdf
    • http://ultraljud.nu/bild/files/99902800953.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/wibavidakexiwobifisasuwop.pdf
    • https://bonaparte.cappencms.com/templates/files/44625722416.pdf
    • http://pivotal-technologies.com/userfiles/file/favoxivuvavowanenunozef.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_20_13_37_47_6982.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=partition+app+for+android
    • 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_off0000ae35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE35 16792 bytes
font_01_sfnt_off0000c647.bin
d42bb473700cad2dc50d7a2f4dcd59913b838b5440c0bb360f648177dece070c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 15532 bytes
font_02_sfnt_off0000ed10.bin
44b275b35d4df037a14c888b98bd96b31569cc25563a89fdc1663e28b1b867a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10148 bytes

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