Malicious PDF — malware analysis report

Static analysis result for SHA-256 75899726194cea29…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 18:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57f8ee387b5b6dd68a2e56f95ef2dfd8 SHA-1: 8c8c28729b75eaf91676d81181ed6ba9a48f9bd4 SHA-256: 75899726194cea2976c860bee545b4b782acf3e881a432f32a380e135312a9cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm on disposable hosting. This pattern is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://goldmustang.com/files/files/72988868569.pdf
    • https://zmiz.hr/userfiles/file/fowinikakaz.pdf
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/33508423102.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0be3f87c---dorunodabosora.pdf
    • http://pescepiana.eu/userfiles/files/tebadib.pdf
    • http://safiorida.dk/operatori/userfiles/file/4233068594.pdf
    • http://craft-personal.de/userfiles/file/26880550346.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdf
    • http://hcbarrett.com/user_area/file/10748878538.pdf
    • http://gld-lining.com/user_img/files/visenotesaxidimutugi.pdf
    • http://cmtdental.com/upload/ckimg/files/34328034594.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210905235445.pdf
    • https://novahealthclinic.ca/userfiles/file/raborufitoniwaxujununud.pdf
    • http://telegid.tv/userfiles/file/kugitoxinador.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87007351106.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161378d695260a---73554545653.pdf
    • http://tlumacz-francuskiego.pl/userfiles/file/zewitogelexojisejen.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/rejimojigex.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/12261368202.pdf
    • https://acrgroup.nl/userfiles/file/53495595394.pdf
    • http://atrsara.ir/resource/files/84012721208.pdf
    • http://ameshamagazine.com/js/upload/files/56930323128.pdf
    • http://reutlinger.pl/userfiles/file/68243460146.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=torrent+fear+the+walking+dead
    • 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_off0000d569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 16792 bytes
font_01_sfnt_off0000ed80.bin
66d74e31d13779bae3f52ba8bdd5fca40be599cd2b4ae37ef7d04060fe087fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 10604 bytes
font_02_sfnt_off00010576.bin
2ed80f71b08947a51905e2ae09860e251cfff956ad2198802109df301ecc2a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 18376 bytes

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