PDF malware analysis — malicious · a23d0c655f4bdb00

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 16:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bfe1f8a257c4b2a9e0ca451580a3f5f0 SHA-1: 1564bac0529a3cbf8ad69c8b88f6bc771b245321 SHA-256: a23d0c655f4bdb005bed4a504ac40d79d4fdb46fff3027aa64959bad84bd16b3

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 heuristic, which are often used for phishing or to download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/89688927997.pdf In PDF document text
- https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/xovazorisatase.pdfIn PDF document text
- http://vagyonvedelemszolnok.hu/admin/fck_upload/file/lofilifagurajis.pdfIn PDF document text
- http://daedukgs.com/admin/fckeditor/data/file/20210908004942.pdfIn PDF document text
- https://nanyangtextile.com/userfiles/file/lolajekube.pdfIn PDF document text
- https://byocamacho.com/ckfinder/userfiles/files/41845714557.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613662583dea0---wasifeboz.pdfIn PDF document text
- https://censcakmu.org/board/file/files/97740308511.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/vamub.pdfIn PDF document text
- https://bahia-group.com/ckfinder/userfiles/files/40254675947.pdfIn PDF document text
- https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vufewadabifiwolasavaj.pdfIn PDF document text
- https://cartolmania.it/file/lirejorujidodesudavusu.pdfIn PDF document text
- http://sb-78.ru/files/file/tosipogakominifazunovo.pdfIn PDF document text
- http://revucue.com/ckfinder/userfiles/files/50255167252.pdfIn PDF document text
- http://balcimimarlik.com/resimler/files/jomosolilas.pdfIn PDF document text
- http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/66393625602.pdfIn PDF document text
- http://xn--h49al71atridzo.com/userData/board/file/66659248398.pdfIn PDF document text
- http://makeyourpartnermelt.com/userfiles/file/mobapifipipunolonugafiw.pdfIn PDF document text
- http://assessmentinsight.com/ckfinder/userfiles/files/goxizoxuma.pdfIn PDF document text
- http://dopuskvsro.ru/UserFiles/75409838905.pdfIn PDF document text
- https://tese.in/ckfinder/userfiles/files/14357140930.pdfIn PDF document text
- http://kantipursecurity.com/userfiles/file/gunupezefarib.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021090400502390.pdfIn PDF document text
- http://bensonlandscape.com/editorData/file/7976690565.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+kodi+android+buildPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010241.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10241	17960 bytes
SHA-256: `2df332bf62c51ff6a830df29fdf9e999f811e98b5c899404420a30999267924f`
`font_02_sfnt_off000130bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130BF	10628 bytes
SHA-256: `0afdbfb358903cd3632a577664335d0ffbf50d479b627bba0e7ffdccbb06b3bb`

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