PDF malware analysis — malicious · fa98077185f9ccc8

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 16:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 05d3a761bfd6034302777d5451c4bbf2 SHA-1: 9c363435c32874ff9b150622263a3468822ab7e1 SHA-256: fa98077185f9ccc8b2599b1d73a8e09e21cc88083a0cdc401d50555414a39de1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which could host further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9958

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 http://khachsandomino.com/hinhanh_fckeditor/file/vemidulikubiwopegososed.pdf In PDF document text
- http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/47086759215.pdfIn PDF document text
- http://www.lasallelille.com/admin/ckfinder/userfiles/files/24370014885.pdfIn PDF document text
- https://0924055971.com/uploads/files/202109090401482647.pdfIn PDF document text
- http://sjmhospital.org/files/js/ckfinder/userfiles/files/somos.pdfIn PDF document text
- http://tcyy88.com/userfiles/file/2021090312334273499.pdfIn PDF document text
- http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902220423673953.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312c53d60b8---53443993654.pdfIn PDF document text
- https://cissud.it/uploads/ck_editor/files/72837671866.pdfIn PDF document text
- https://xn--fct8ml6mwue.tw/uploads/files/pukatiwolegonugudabut.pdfIn PDF document text
- https://qkon.ca/images/file/83213340215.pdfIn PDF document text
- http://jingmingtai.com/filespath/files/20210901120158.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/aumr84ptop5pfn8setkpmupj63/69426321171.pdfIn PDF document text
- https://cargobull.cz/res/file/23337484992.pdfIn PDF document text
- https://tectrongim.com/uploads/file/57850827730.pdfIn PDF document text
- https://lyna-garage.com/htdocs/cljr/data/files/31105479647.pdfIn PDF document text
- https://ourcampuswindow.com/ckfinder/userfiles/files/22294972864.pdfIn PDF document text
- http://mirsistem.com/depo/sayfaresim/file/33388507539.pdfIn PDF document text
- https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/70875078118.pdfIn PDF document text
- http://escrima-rlp.de/userfiles/file/52797754183.pdfIn PDF document text
- http://grupophi.es/uploads/files/vokolaxeperuvaleno.pdfIn PDF document text
- http://morpheus-architects.com/file_media/file_image/file/77668043299.pdfIn PDF document text
- https://fallahi-sch.com/userfiles/file/45320901397.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=account+live+recoveryPDF link annotation
- 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_off0000cfde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFDE	17388 bytes
SHA-256: `274c1e3ce5cbf0dd2064fec9c9703fa68b3adcd573f8004ec52314a1fe81275d`
`font_01_sfnt_off0000fd1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD1C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011533.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11533	10156 bytes
SHA-256: `b33ce043e9211643a9086a32718d89f29e7965d048337fcc466e51bb3a4b7553`

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