PDF malware analysis — malicious · 5ab892934df6643a

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 22:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d9ad212658163fdc7a571f9642fe4993 SHA-1: 9a350bf994b84734ebe7c34e18953641e2cee46d SHA-256: 5ab892934df6643a6918e2596456ea3dffcbea5d76315b2ea95908f85bc74c84

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://dlzhrjd.com/images/uploadfile/files/46136601079.pdf In PDF document text
- https://atlaskvartir.ua/data/uploads/files/vusuganexolaguzujebo.pdfIn PDF document text
- https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zagegekokakapineki.pdfIn PDF document text
- https://cplastik.com/data/cms/file/43424795982.pdfIn PDF document text
- http://varosom.hu/userfiles/files/nularadovosinoloz.pdfIn PDF document text
- http://elitvorota.ru/f/file/bifuza.pdfIn PDF document text
- https://ceylanotel.com/firma/files/10521501583.pdfIn PDF document text
- https://banerjeetourspecial.in/ckfinder/userfiles/files/mozuv.pdfIn PDF document text
- http://lienming-rubber.com/uploads/files/202109031624128764.pdfIn PDF document text
- https://isleo.com/i_photos/file/xafewilolalewekefapumoki.pdfIn PDF document text
- http://letnipohar.cz/upload/file/juzozot.pdfIn PDF document text
- http://freetourscadiz.com/ckfinder/userfiles/files/56741702897.pdfIn PDF document text
- https://hantverkarenisandby.se/UserFiles/files/91653550639.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/42213673660.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7dd6edfe5f39f88400a1e6737d2a98e3/75008029284.pdfIn PDF document text
- http://hotelbelleepoque.bg/userfiles/file/60942987033.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/timidevupodivegive.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/vufeduzigoxepi.pdfIn PDF document text
- http://creative-format.com/upload/editor/files/267402659.pdfIn PDF document text
- https://mytekas.com/UserFiles/file/46637457478.pdfIn PDF document text
- https://nutricount.cz/UserFiles/File/zulabajabedilosori.pdfIn PDF document text
- http://kubkao-kubpla.com/userfiles/files/22052420464.pdfIn PDF document text
- https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/2957156462.pdfIn PDF document text
- http://peach2560.xyz/js/ckfinder/userfiles/files/fobozefarokipapavumuvu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=2+hearts+torrent+magnetPDF 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_off0000d90f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD90F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f126.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF126	10440 bytes
SHA-256: `30e201e1ca08548d24c07551c8e28d3df4eb33d7e3e2586fdeef45a721e8db64`
`font_02_sfnt_off000108b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108B5	18472 bytes
SHA-256: `a68bac3e349483b20a4545241523590ac113b536f77d777b79c9485b9d627705`

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