PDF malware analysis — malicious · 86779a5bdbf93657

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 12:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0eda8d4d20f5a28d8d9f33fc445f15a8 SHA-1: 9d833caab855d190d9dc628b2e9b5151ddb5b7ea SHA-256: 86779a5bdbf93657e3991be167ad03a0346699e440c6fc0e6a4417fb40bf1e98

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it's part of a link farm, likely designed to redirect users to malicious sites. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=podcasting+app+for+android PDF link annotation
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e0b95d33c9c93a43de101831a9b7bd48/69452192041.pdfIn PDF document text
- http://felixefontesadvogados.com.br/ckfinder/userfiles/files/6808017329.pdfIn PDF document text
- http://7serve.org/userfiles/file/20210919175102.pdfIn PDF document text
- http://woori-tour.kr/FileData/ckfinder/files/20210918_24FCBAE7E7DC3AEF.pdfIn PDF document text
- https://istanajpdua.com/contents/files/suvuvugenu.pdfIn PDF document text
- https://birgatour.mn/js/ckfinder/userfiles/files/tutov.pdfIn PDF document text
- http://smartdeal.pl/files/upload/files/beviminofobivonewid.pdfIn PDF document text
- http://kino-cosmik.ru/sadm_files/87934189378.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/28c9abaa8b92f0f23928ef82ea63fcce/vukeriwenoxogelifibeg.pdfIn PDF document text
- http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
- http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwadubatageborof.pdfIn PDF document text
- https://tucarrorentacar.co/ckfinder/userfiles/files/96392718270.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/32754856872.pdfIn PDF document text
- http://colorfusion.us/admin/images/file/42456130604.pdfIn PDF document text
- http://japhina.com/upload/file/26630677848.pdfIn PDF document text
- http://datacomsystems.cz/userfiles/file/luzegeribunirejubosogis.pdfIn PDF document text
- http://tiszaladany.hu/upload/file/tikopabapivapupixixip.pdfIn PDF document text
- https://topupdana.com/contents/files/gopapenegejupowagigetux.pdfIn PDF document text
- http://gardatrans.com/content/Files/zifuvotimef.pdfIn PDF document text
- https://betalinktech.com/blmedia/file/82380840332.pdfIn PDF document text
- https://skywaytravelandholidays.com/ckfinder/userfiles/files/81244298067.pdfIn PDF document text
- http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/xuvurosupagesikefemitigaz.pdfIn PDF document text
- http://studiostocchi.eu/userfiles/files/24678609592.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/73556627521.pdfIn PDF document text
- http://cannamelis.com/userfiles/file/37354491807.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_off0000ed7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED7D	17168 bytes
SHA-256: `e2ddbea1c631cc2de113a9cf7a31daf8c2e60089c9ca983009f2de193ead3c04`
`font_01_sfnt_off000119f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119F3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001320a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1320A	10616 bytes
SHA-256: `ad2d424f91ffd9cc9b881e8c0a5805b9d70da910b8cd6944e70187a930d1b8e0`

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