PDF malware analysis — malicious · 617b2c867a3d200a

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 22:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 051759945ac6ba035dd1b073dcf0b391 SHA-1: fa185e8f1a0f8f442814524ec9b5821c1165fc77 SHA-256: 617b2c867a3d200a6adc9eaf3e52500ac5b7f4f68879f2c4a05d03e6d49eb5d7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a large number of external URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign designed to distribute further payloads or collect user credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=wifi+on+android PDF link annotation
- https://cuatudongnhatrang.com/uploads/files/zufototer.pdfIn PDF document text
- http://1night2daytour.com/ckupload/files/73672401473.pdfIn PDF document text
- https://foodvellythailand.com/upload/files/geboreg.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b9fbad78---55256652051.pdfIn PDF document text
- https://olterus.com/contents/files/3102288720.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f007234531fde8e6dd300f0a93480d2f/mezizojagixewa.pdfIn PDF document text
- https://resulgame.com/calisma2/files/uploads/vosezigikizizudesagas.pdfIn PDF document text
- https://slezanie.eu/userfiles/file/19570029326.pdfIn PDF document text
- http://aorganboys.handyfriendship.com/upload/files/66418788990.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/62640704812.pdfIn PDF document text
- http://www.psoealora.es/ckfinder/userfiles/files/wadezemomideminoxo.pdfIn PDF document text
- http://yachtales.net/admin/userfiles/files/fupavumoguboserel.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/98380549489.pdfIn PDF document text
- https://gedayapi.com/userfiles/file/wusegem.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/nugazirenejew.pdfIn PDF document text
- http://issaproject.com/app/views/panel/ckfinder/userfiles/files/farajajupogexa.pdfIn PDF document text
- http://www.examnotice.in/uploads/files/94602164118.pdfIn PDF document text
- https://perfecthospitals.com/FCKeditor/file/gebolewogekur.pdfIn PDF document text
- https://tradingphrases.com/userfiles/files/94045024618.pdfIn PDF document text
- http://mskabel.cz/UserFiles/File/39850655177.pdfIn PDF document text
- http://vuason.vn/upload/files/49825070160.pdfIn PDF document text
- https://currenwatch.myhost360.cn/file/upload/files/09-11-09-26-32-35.pdfIn PDF document text
- http://www.skk.com.hk/admin/ckfinder/userfiles/files/gojugelikod.pdfIn PDF document text
- http://gold-carsales.com/js/upload/files/masexoniraduwutawuru.pdfIn PDF document text
- http://pusheng168.com/uploadfiles/20210909134728.pdfIn PDF document text
- 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_off0000bdb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDB2	9896 bytes
SHA-256: `d3a0e73f048000acb051030cd99fb5ce1d9910a88432e8a06834215eaa738c0f`
`font_01_sfnt_off0000d38c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD38C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eb9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB9E	16100 bytes
SHA-256: `22831f1e1f264054f74527dc1368cfc7a795255dd863a16f3fcdd06102130096`

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