PDF malware analysis — malicious · 202c02548a0d87d1

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2a56fe6e048c6bbadeeabbb66b6a3cb7 SHA-1: 64af16aa59a86488cd2ce3469c5b72ed0dc4d05d SHA-256: 202c02548a0d87d170a3f4adbb1bb73a2d7121d2bf46fc3579589eb734c01819

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. Heuristics indicate the presence of embedded JavaScript, a common technique for executing malicious code within PDFs. The numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggest a link farm designed to distribute or obscure the ultimate payload, likely a phishing lure or downloader.

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://crysiq.ru/uplcv?utm_term=jeux+android+2017 PDF link annotation
- http://whuntex.ru/userfiles/file/15852362178.pdfIn PDF document text
- http://hanahana.vn/media/ftp/file/59761787597.pdfIn PDF document text
- https://schachverein-marchhoefe.ch/fcsr/news/upload/file/46929088063.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9f425bfe---64880078857.pdfIn PDF document text
- http://iqlacpro.vn/emotive/upload/files/vesurozida.pdfIn PDF document text
- http://irvine.songhakbbq.com/uploads/files/lijupalijojazomulol.pdfIn PDF document text
- http://inlovehuahin.com/file_media/file_image/file/nuveseraf.pdfIn PDF document text
- http://asdgolfclubtoscana.com/writable/public/userfiles/file/47558239518.pdfIn PDF document text
- http://meetburgerusa.com/uploads/files/tufugilaxopipijenufisap.pdfIn PDF document text
- https://cheesykeju.com/contents/files/36336516243.pdfIn PDF document text
- https://kingyao.com/uploadfiles/files/20210908_065600_7153.pdfIn PDF document text
- http://ozanatalan.com/iboard/includes/userfiles/files/79181787891.pdfIn PDF document text
- http://hsaltsj.com/uploads/files/90742754088.pdfIn PDF document text
- https://namratalakhotia.com/userfiles/files/28031889189.pdfIn PDF document text
- http://myflora888.com/ck_files/files/vevorefitapikarupefozidej.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613130f47e7f5---gulen.pdfIn PDF document text
- http://lexprikson.com/admin/style/images/userfiles/file/30518936078.pdfIn PDF document text
- https://estatecambodia.com/htdocs/cljr/data/files/55671074619.pdfIn PDF document text
- https://picinterior.com/ckfinder/userfiles/files/tesibaporetapo.pdfIn PDF document text
- http://rayer.cn/d/files/69496964164.pdfIn PDF document text
- https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/74139999400.pdfIn PDF document text
- http://geologocarmignani.com/userfiles/files/sexutabiwonozujozu.pdfIn PDF document text
- http://hkwwta.org/userfiles/93488674344.pdfIn PDF document text
- http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909051812209808.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_off0000e258.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE258	10468 bytes
SHA-256: `334d266180c3639883e1d8c7e9fa1a0e9400c38f1bd3542ce62e5e409d4c8d26`
`font_01_sfnt_off0000fa53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA53	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011265.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11265	19144 bytes
SHA-256: `b37c242cd7f559cda98fe4aaaf613e2dbd8f858ee102a0aa238407b381b5709e`

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