Malicious PDF — malware analysis report

Static analysis result for SHA-256 2012cab716c423e0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 11:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a46bcc2a072274cdf9da4db9cef85359 SHA-1: 68cf1099917c710335b67e55fe5d1a59a20b807f SHA-256: 2012cab716c423e0b2757f9e481ed2f6230d43ab9c5bffab281b4b11f8096e68
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 redirection to external URLs, as evidenced by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://seikai.jp/free_images/files/98845058887.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167c5bf598---59031058349.pdf
    • http://www.fashiongale.ro/userfiles/files/mekofirugabotobivadede.pdf
    • http://jiangsutravel.kr/userfiles/files/20210907_165202.pdf
    • http://pensionpoint.cz/userfiles/files/teveraxavulomolewal.pdf
    • http://kaies.cn/upfiles/file/39718058814.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/77365121791.pdf
    • https://gruppopolidori.com/upload/image/file/87117611061.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/rerekogu.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/lupemokufosaxena.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/33929359671.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xosemamululefukade.pdf
    • https://finliz.lt/i/File/kogulavafoxofimema.pdf
    • http://villaroyalenews.com/userimages/55998887002.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/35180290373.pdf
    • https://landatur.com/files/galeria/files/99281527925.pdf
    • http://gazosilikatnn.ru/uploads/files/18992844165.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3s7ldbht2m30737nqd785i3t1/82147294326.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/7151258484.pdf
    • http://flex-link.cn/uploadfiles/files/75061526562.pdf
    • http://maksimetall.ru/files/43627501338.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dangal+full+movie+in+tamil+hd+1080p+free+download
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/81906778470.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_off0000d7a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
font_01_sfnt_off0000efb7.bin
2b4194aca69e673841df9cd1039ba7c1173e4d972c7f2a6e41df3512158fe5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 11412 bytes
font_02_sfnt_off00010a4d.bin
f8a154728f8420c2d18c0a466d118f0c17a537f557700d94ca6f6aa6e8195e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 19256 bytes

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