Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce38f3f8eebea0af…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 01:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb3b2f089fc3c8926b2498cbfd5ff9e2 SHA-1: 381c430710f75748a65f2882c773375c6cebdcf1 SHA-256: ce38f3f8eebea0afeecc8bc24a0f448d80df659469d8559fb1d06f8340021921
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 sample also exhibits characteristics of a link farm, with numerous distinct hosts and disposable URLs, suggesting an attempt to obscure the ultimate destination or distribute payloads from various sources. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://darec.sk/files/files/6100941110.pdf
    • http://apexnepaltravel.com/userfiles/file/16236270979.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sibedofexerib.pdf
    • http://www.anjhimayath.com/upload/file/goribemomoniwos.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/71814570488.pdf
    • http://enewind.com/pliki/file/zajesarepabivoxisavefilup.pdf
    • https://presstone.hu/userfiles/file/zenakutujose.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161314b80b65d9---vegukuzovim.pdf
    • http://sincaremedicaltour.com/js/upload/gemaraga.pdf
    • http://giaydantuongphongngudep.com/images/news/file/wajikobevonogonezon.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/96406077188.pdf
    • https://menokatea.com/ckfinder/userfiles/files/40086577251.pdf
    • https://avenue102.com/uploads/file/damexadiz.pdf
    • https://kakakmanis.com/contents/files/setev.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614848593a2a6---61796175848.pdf
    • http://mrpokedb.com/uploads/files/vagetizitotifulemakigax.pdf
    • https://equator-maritime.com/userfiles/file/fekavepunudum.pdf
    • http://splogservice.ru/content/files/25807053955.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/27429496768.pdf
    • http://khonggianmang.com/upload/files/namosawufun.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/mukijozenajutu.pdf
    • http://nessium.net/userfiles/file/megeviwukiloxadepina.pdf
    • http://tomekorea.com/userData/board/file/dejajudowan.pdf
    • http://sahrugs.com/userfiles/file/kufimi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=staggered+gridview+android+github
    • 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_off0000e753.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 16792 bytes
font_01_sfnt_off0000ff6a.bin
9e73a732510ed310ff160689ba91bb9d0e2d25dcb05b4bccea6f980c8590a311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10780 bytes
font_02_sfnt_off00011801.bin
0b1597a33473ec8c2eb8f735f62110580502897118d70e873385f902bd9d6bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 18676 bytes

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