PDF malware analysis — malicious · cbd883342984db9b

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 04:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c3acf418327ef46afdcbd96a3119e9a4 SHA-1: b36350238b25eec9102b1b06af1b0a0c0ddf251d SHA-256: cbd883342984db9b82f9bc6f84a1346688cc19445ab907a957bc9e42d68b9a83

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 5

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.
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://oniceh.ru/uplcv?utm_term=free+download+vcard+file+for+android PDF link annotation
- https://cytairtool.com/test/userfiles/file/20210911_c0cfa.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/38159024450.pdfIn PDF document text
- http://gojjang.com/uploads/files/vumulanerutip.pdfIn PDF document text
- http://pttaccounting.com/userfiles/files/tadapibonudejefugebal.pdfIn PDF document text
- http://metabolizmusonline.hu/images/upload/file/fomemagewadujubarapeko.pdfIn PDF document text
- http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/70120732267.pdfIn PDF document text
- https://thediamangroup.com/_images/files/27198053078.pdfIn PDF document text
- https://ourlady-schools2.com/userfiles/files/81100545326.pdfIn PDF document text
- http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/79122569341.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb58febb2c---bijatanapuwagifut.pdfIn PDF document text
- https://ktmcollege.org/public_html/userfiles/file/tumajaweleforux.pdfIn PDF document text
- https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16307186769832.pdfIn PDF document text
- http://citty.org/images/uploads/file/56135496486.pdfIn PDF document text
- https://visualarchive.bg/files/pinexumijediwakilufobeti.pdfIn PDF document text
- http://westernmaki.com/uploads/files/kunawutovo.pdfIn PDF document text
- http://www.dfdtrading.sk/ckfinder/userfiles/files/30882505013.pdfIn PDF document text
- https://anyimaker.com/upload/users/files/85847876340.pdfIn PDF document text
- http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/welubojepesasoxomaxaful.pdfIn PDF document text
- http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/zulunipuromonabesawadew.pdfIn PDF document text
- https://svingenieria.cl/userfiles/file/panepebulowu.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/zosif.pdfIn PDF document text
- http://vngo-cc.vn/cooker/public/files/puzisefijonudofipelufodip.pdfIn PDF document text
- http://termosystem.pl/userfiles/file/93234819595.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_off0000d8e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8E3	10332 bytes
SHA-256: `14b34de78e11ccc3313bc6c169d0608988d795879e7039739befb165f2c30916`
`font_01_sfnt_off0000f049.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF049	17948 bytes
SHA-256: `64808059504f8fc0404f4445efc5ebabcb665a749aec425944c3ec995de7688a`
`font_02_sfnt_off00011e8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E8D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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