PDF malware analysis — malicious · 3edcfa18f86b57e1

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 07:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c64711412484b81d00f19f4e51bcbe9d SHA-1: e51bc07e6f7e35f5402d354e751b1262a2bea83d SHA-256: 3edcfa18f86b57e12995cd86afd9fd2903f3edf248fd4b857db2d31d85fc5f20

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded JavaScript stream (PDF_JS) and numerous external URIs suggest the PDF is designed to redirect users to potentially malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://sun-tes.ru/files/file/37779870511.pdf In PDF document text
- https://laptoptranganh.com/data/dulieu/files/7132147430.pdfIn PDF document text
- https://billard-hauri.ch/userfiles/file/tawavavasotarovetut.pdfIn PDF document text
- http://vuatoyen.com/uploads/userfiles/file/toxomufesufizeda.pdfIn PDF document text
- https://munis-roquesalbes.cat/demo/vilalba/imatges/file/27272598942.pdfIn PDF document text
- http://springgalleryng.com/Images_upload/files/68567574801.pdfIn PDF document text
- https://tktravelkorea.com/FileData/ckfinder/files/20210909_396F2EDB6A10DE39.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136943687afc---89528894189.pdfIn PDF document text
- http://nfc-lampang.com/user_img/files/tunejirivamigasatugugu.pdfIn PDF document text
- https://sibiucuratenie.ro/fckeditor/userfiles/file/66963219485.pdfIn PDF document text
- http://fu-xin.tw/uploads/files/202109071508065361.pdfIn PDF document text
- https://angel-juicer.com/FileData/ckfinder/files/20210908_7CAF4B8B16E0192F.pdfIn PDF document text
- http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/gunefugi.pdfIn PDF document text
- https://alcoquimicos.com/ckfinder/userfiles/files/44480887222.pdfIn PDF document text
- https://stiff.pl/ckfinder/userfiles/files/7015278654.pdfIn PDF document text
- http://aviapartner.biz/js/ckfinder/userfiles/files/45849814274.pdfIn PDF document text
- http://elitakhealing.com/ckfinder/userfiles/files/28686028140.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358eddeb347---novojibidegud.pdfIn PDF document text
- https://faktxeber.ru/resimler/files/jadigatufar.pdfIn PDF document text
- http://ukicda.com/admin/fckeditor_upfiles/file/2021091014204480554.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021090321340539.pdfIn PDF document text
- http://peaceinsrilanka.lk/ckfinder/userfiles/files/2570686498.pdfIn PDF document text
- http://trevelci.ru/ckfinder/userfiles/files/bovoruvubuvagi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=zepeto+download+appPDF 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_off0000ddb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDB8	18084 bytes
SHA-256: `1fd9c1335c8ff04715bf802886529c317c6786c04042c0e4f3552d1098b7e7b7`
`font_01_sfnt_off00010c11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012428.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12428	10076 bytes
SHA-256: `084669cb69d4946bafd3e2e04d5ae3793124d19ce290001ea9d950a29838a673`

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