PDF malware analysis — malicious · 5c23b0d164e9d37b

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 19:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 5e2cece4697da24dcdb9fac35484f312 SHA-1: 4b82fa08aa572cd07a5961416af799913e3217ea SHA-256: 5c23b0d164e9d37b8ab97c198d03bc5fe7d8cf868fa341d3079551a24a4befe6

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. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting it's designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=introduction+to+real+analysis+3rd+edition+solution+pdf PDF link annotation
- http://bloodfaces.de/attachment/file/vanexarefajip.pdfIn PDF document text
- http://maidichike.com/upload/files/dewukepijejaxexe.pdfIn PDF document text
- http://thaymanhinhlaptop.com/userfiles/file/rorenijeziki.pdfIn PDF document text
- http://sntaviator.ru/ckfinder/userfiles/files/35772433038.pdfIn PDF document text
- https://weldingportal.it/userfiles/file/91726115799.pdfIn PDF document text
- http://worldtile.net/jangheung/userfiles/file/risivejurojodaguze.pdfIn PDF document text
- https://sbsoftware.ro/admin/userfiles/file/64133267302.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161509b5238012---17184118791.pdfIn PDF document text
- http://lollanaclinic.com/image/upload/File/65788050188.pdfIn PDF document text
- http://kingtonkatsu.com/uploads/files/pijusalezituxo.pdfIn PDF document text
- https://sitycare.com/FCK-UserFiles/files/29454409883.pdfIn PDF document text
- https://auto826.vnpec.xyz/uploads/files/264538454.pdfIn PDF document text
- https://iva-vietnam.com/userfiles/file/losazaf.pdfIn PDF document text
- http://vibestedu.com/_UploadFile/Images/file/pesatazenugexum.pdfIn PDF document text
- http://ansonseatery.com/uploads/files/xuzewirapim.pdfIn PDF document text
- https://habibitours.com/ckfinder/userfiles/files/71817196809.pdfIn PDF document text
- http://kcntanduc.vn/img_duhoc/files/bobalogegilemimojexiti.pdfIn PDF document text
- https://noble-program.site/js/ckfinder/userfiles/files/bunorobimotudonimi.pdfIn PDF document text
- https://guijek.com/userfiles/file/55929919910.pdfIn PDF document text
- https://florerialafloresta.com/ckfinder/userfiles/files/jopexidonibigo.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wibujanimukujojiwomupixu.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad962d03ff---toluzabajurulolapegefe.pdfIn PDF document text
- https://hahapediatric.com/uploads/files/202109060031368787.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_off0000b114.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB114	10948 bytes
SHA-256: `3d2d6dbbc64716af55281778f624897e1e82346d4d158e4812c388b4560990f1`
`font_01_sfnt_off0000caa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAA2	15272 bytes
SHA-256: `add517ed13e96fae6a7ebc16bbf53b4e528311acb27549ede1663fd4c2761a08`
`font_02_sfnt_off0000f17a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF17A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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