PDF malware analysis — malicious · edd92857140e88b6

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 19:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 477174efa7c917da9891279595189fa0 SHA-1: 7145e7c274dde0927157f33e8a5d9b40e691d103 SHA-256: edd92857140e88b63b6c200341d8a4f5f8ad0fc3aac1237a531f8d3b97382ef4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on disposable domains. The embedded URLs, such as https://baoyi-chuck.com/ckfinder/userfiles/files/98025075185.pdf, are likely used to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 5

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.
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://baoyi-chuck.com/ckfinder/userfiles/files/98025075185.pdf In PDF document text
- https://primer-spb.ru/files/files/65456802561.pdfIn PDF document text
- http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/toxegatuterugipadiwuliwox.pdfIn PDF document text
- https://austarpharma.com/upload/files/sinipeduwuribuzip.pdfIn PDF document text
- https://bevillelecomte.ovh/ckfinder/userfiles/files/32645107892.pdfIn PDF document text
- http://fohow77.ru/upload/file/fiwutalikijufoguv.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463b7c960c6---61971340126.pdfIn PDF document text
- https://bushregenerators.com/userfiles/files/kawavonowilux.pdfIn PDF document text
- http://strelnicebudejovice.cz/userfiles/file/pulebalegufin.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/46611434906.pdfIn PDF document text
- http://kimhoatra.com/upload/fckimagesfile/wozapetelabibojiparelitiv.pdfIn PDF document text
- http://www.benyowsky.com/resources/files/tebogodisofebujiwe.pdfIn PDF document text
- http://posekatzahradu.cz/files/file/70650412741.pdfIn PDF document text
- https://onhimalayas.com/ckfinder/userfiles/files/93022383220.pdfIn PDF document text
- https://cvzona.lt/resources/img/files/denavulurimagotiba.pdfIn PDF document text
- http://grandioso.asia/editor_upload_image/file/zigenanivijixifafa.pdfIn PDF document text
- https://websbag.com/uploads/files/1896521931.pdfIn PDF document text
- http://thamcohoaian.com/webroot/img/files/nimumizadem.pdfIn PDF document text
- https://tvsporedi.si/vsebina/wuwakuzo.pdfIn PDF document text
- http://burattinojatek.hu/userfiles/file/19789397828.pdfIn PDF document text
- http://csim.jp/ckeditor/uploads/files/kafosedikikesatafifexaj.pdfIn PDF document text
- http://radio-salsa.com/php/rs/filesupload/file/doziva.pdfIn PDF document text
- http://ceroki.com/image/files/5102095841.pdfIn PDF document text
- http://oroblupiscine.it/userfiles/files/84492505859.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+bootcamp+2016PDF 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_off0000ca8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA8A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e2a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2A1	10912 bytes
SHA-256: `ca22e4fd32918644e4ef987163219ac2372a4101d22f71e6eb6e651909e00d22`
`font_02_sfnt_off0000fbb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB2	18144 bytes
SHA-256: `2b05a736aa78ab28e8bb876400d62a69e03e9e0a0e5986c6a402b956ae76bb86`

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