PDF malware analysis — malicious · becc915a8b468c3d

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: cf8e1dab846f6cea5d9990235f45a00f SHA-1: ce7f4c4a61c62a18bcc4cedf2a5434d2b8f02ed8 SHA-256: becc915a8b468c3d413b9b23875a6b102728a82cd97a98b2ba2e8a9466afecad

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content or download further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of JavaScript points to exploitation for client execution, and the overall structure suggests it was delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=steam+among+us+download PDF link annotation
- http://kaitosushisb.com/uploads/files/tegalixan.pdfIn PDF document text
- http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/witibitanawefugupuziz.pdfIn PDF document text
- http://kbinteriery.cz/userfiles/file/78886306234.pdfIn PDF document text
- https://eqonetech.com/upload/userfiles/files/79345282711.pdfIn PDF document text
- http://vtdsbinhthuan.vn/public/uploads/userfiles/file/fesanuduwolejawedufe.pdfIn PDF document text
- http://popnmusic.fr/userfiles/file/mozetewuvaraxob.pdfIn PDF document text
- http://nail-free.com/ckfinder/userfiles/files/58097313819.pdfIn PDF document text
- http://fsgpj.com/upfolder/e/files/20210903035154.pdfIn PDF document text
- http://secureyun.cn/uploadfile/file///2021090613051247.pdfIn PDF document text
- http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jugivobig.pdfIn PDF document text
- http://marsalanoleggio.it/userfiles/files/20883010718.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613a24ceb98b3---76173034050.pdfIn PDF document text
- https://pakistanchristiancongress.org/userfiles/file/dosavumok.pdfIn PDF document text
- https://ketdoanbus.com/webroot/img/files/32051152350.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff904bb795---55520079331.pdfIn PDF document text
- https://mimpishio.com/contents/files/36219026102.pdfIn PDF document text
- https://linkevicius.com/upload/galery/file/wepisifotej.pdfIn PDF document text
- http://zekidilektekstil.com/images_upload/files/rixaw.pdfIn PDF document text
- https://eniedu.com/data/file/20210901071614.pdfIn PDF document text
- http://kasargod.net/uploads/file/91791345175.pdfIn PDF document text
- http://herve-coiffure.ci/files/lalukejivunanatutenaxeg.pdfIn PDF document text
- http://hkalc.com/userfiles/ludinakilelu.pdfIn PDF document text
- http://soles2walk.cz/data/file/83692346594.pdfIn PDF document text
- http://chayka-svg.ru/files/424195078.pdfIn PDF document text
- https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/retenobon.pdfIn PDF document text
- http://obraz-tlt.ru/userfiles/file/zosijegulewa.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_off0000b6e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cefa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEFA	10660 bytes
SHA-256: `87b58d88cfd8f25f9a0b83e2e37d4812ce18e2e3d5d8828f7a7243ca547a520e`
`font_02_sfnt_off0000e73f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE73F	17052 bytes
SHA-256: `51ce7ee071dfcb72e306f8b7add4d790e8b8974a176f71fd78a7289c431b004c`

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