Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4384309359f8d89…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 04:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0721bb7dee950aff0868dd9b04bcfa11 SHA-1: e7294b79082a5529fd719cf9e33d318727b46188 SHA-256: c4384309359f8d89d8fe85b05efdca8ba141ca32328a99f0e04bbb387874c93d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No specific family is identifiable from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kompaspt2.com/contents/files/44490415657.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b9bc67bf---fubudaxur.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210916_180638.pdf
    • http://stardentalcare.org/userfiles/file/kogis.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/gixexoneb.pdf
    • http://v-lukomorie.com/uploader/files/84844504003.pdf
    • http://studiorinaldibedin.eu/userfiles/files/2553586994.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/38978798037.pdf
    • http://jyjwqj.com/uploadfile/file///2021091315132136.pdf
    • http://phongkhamthienhoa.org/images/files/12392064740.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/vezom.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/18684692225.pdf
    • https://sunarchegypt.com/userfiles/file/27625434707.pdf
    • http://ambulanceservice.pl/userfiles/file/magamoxojenisixoju.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zenifanu.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/vaxegigomibusikovaradimo.pdf
    • http://budaors.varosom.hu/userfiles/files/dipanufuxo.pdf
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/82072624909.pdf
    • https://vanrun-it.nl/userfiles/files/gozanowowo.pdf
    • https://joinvita.com/neu/userfiles/file/40295386439.pdf
    • https://rubenoferro.com/userfiles/file/96375835198.pdf
    • http://wpchkg.com/upload/image/file/47621410627.pdf
    • https://hiroyoung.com/data/files/291447088.pdf
    • http://verduciautodemolizioni.it/userfiles/file/67268613483.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+reminder+app+for+android+2020
    • 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_off0000e116.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16792 bytes
font_01_sfnt_off0000f928.bin
f39d2cc7ef9b86e4cde68c07b2569334254a538bca4a0a0435a923bc2e555d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 17480 bytes
font_02_sfnt_off00012671.bin
a99f6072a648a175f7f1521c7923d48756ddc1a110d1fc2efcf89ed38a51e77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 10908 bytes

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