PDF malware analysis — malicious · 37f99c79efa39b40

MALICIOUS

PDF

114.0 KB Created: 2021-09-16 05:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0f4e0caa30b972ba88b9efcfb9d1bfcb SHA-1: 7afbf5f13ff59602b6d03d864a18d18fac5afb99 SHA-256: 37f99c79efa39b4031a965900a375c4c3d8b7975ec5e71761ddf711045f45b7a

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically flags this as a credential phishing attempt impersonating Apple, with the linked host not matching the brand. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://synerhu.ru/uplcv?utm_term=hack+isp+for+free+internet+android.
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://synerhu.ru/uplcv?utm_term=hack+isp+for+free+internet+android PDF link annotation
- http://puzynowska-kancelaria.com/userfiles/file/82519335962.pdfIn PDF document text
- http://chamdure.com/DATA/files/lubaribizofemidenafiped.pdfIn PDF document text
- http://cartonwrappingmachine.com/userfiles/file/33873923260.pdfIn PDF document text
- http://zbraneklapka.cz/ckfinder/userfiles/files/luxiz.pdfIn PDF document text
- https://bocion.com/ckfinder/userfiles/files/35670447050.pdfIn PDF document text
- http://loadcell.vn/Images_upload/files/24846859903.pdfIn PDF document text
- http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/83290596243.pdfIn PDF document text
- http://pp-aqua.com/userfiles/files/lijenududujisokivo.pdfIn PDF document text
- https://zagorjeadventureteam.hr/files/keridisuvutov.pdfIn PDF document text
- http://andlupa.com/userfiles/file/85358694219.pdfIn PDF document text
- http://domuran.pl/files/file/viwesatugug.pdfIn PDF document text
- http://alptw.com/images/files/vaxutedusuvezowotasuminor.pdfIn PDF document text
- http://www.santabriganti.org/admin/ckfinder/userfiles/files/31615641138.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/senimugale.pdfIn PDF document text
- http://istvietnam.com/rich_editor/file/25598495351.pdfIn PDF document text
- http://proxima-design.cz/files/file/kitazodi.pdfIn PDF document text
- https://abss.pt/userfiles/file/79355986782.pdfIn PDF document text
- http://hanleyresources.com/images/denebatoju.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b51b92022---zonajixu.pdfIn PDF document text
- http://miyagi.chi-kara.net/Upload/files/tuvapapodaruwajukuta.pdfIn PDF document text
- http://jinyezi.cn/upload/jideruvukefanutinobapog.pdfIn PDF document text
- https://octvads.site/js/ckfinder/userfiles/files/18172470680.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_off0001541d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1541D	10652 bytes
SHA-256: `72abf589614eb19292deffedc44b1894e226b5c92f3ee1c80ec4b7d6c5904444`
`font_01_sfnt_off00016ca1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16CA1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000184b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x184B3	20264 bytes
SHA-256: `6118fbe152735f043bbdeda48ebf25ec150789246d429546aad29af5040b84ff`

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