PDF malware analysis — malicious · 47d0070131e61be3

MALICIOUS

PDF

76.5 KB Created: 2021-10-10 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9cf42776b075f53b742597761a7e88a3 SHA-1: 6036f67bf78446ef37601576e7d68c3d5fde6e10 SHA-256: 47d0070131e61be35ba3e9cd706c38e03b30e66f079ef6853453c263ca680e5d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for phishing and malware delivery. The PDF also contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm, further indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://queure.ru/uplcv?utm_term=html+ordered+and+unordered+list PDF link annotation
- http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/kokagonifaxinazile.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1d5c2b573f5c22fc7cdd940cf7f708f1/22777006874.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdfIn PDF document text
- https://stayinbranson.com/ckfinder/triplebuserfiles/file/saxuxexexomaz.pdfIn PDF document text
- http://newbusan.net/FileData/ckfinder/files/20210914_E1AEF292B3457046.pdfIn PDF document text
- http://uptownherndon.com/uploads/files/fanutudel.pdfIn PDF document text
- http://fruhmann-elektrotechnik.at/bufozuvuzareridutujax.pdfIn PDF document text
- https://shivajigrihnirman.com/singhania/downloads/file/zuralemasifizok.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r1e2bfjffmt8j491rn6m64cqi2/44630527715.pdfIn PDF document text
- http://salkim.com/userfiles/file/kutowidavip.pdfIn PDF document text
- http://www.flamanville-76.fr/upload/file/28815337268.pdfIn PDF document text
- http://recrute.fr/files/files/85004772827.pdfIn PDF document text
- http://kurskodkb.ru/page_edit/_samples/userfiles/files/46620466664.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/ragibujemolakiz.pdfIn PDF document text
- https://aljuboori.com/userfiles/files/62012793563.pdfIn PDF document text
- http://colorfusion.us/admin/images/file/91336396085.pdfIn PDF document text
- https://bcm.es/files/galeria/files/68749842572.pdfIn PDF document text
- http://obuchenie.bititechnika.com/img/file/59249236200.pdfIn PDF document text
- https://ratoempat.com/contents/files/voxarilerufomebuj.pdfIn PDF document text
- http://geose.ru/userfiles/file/86001403663.pdfIn PDF document text
- https://eminenceconstruction.ca/viking1/uploads/files/lulawekaraminira.pdfIn PDF document text
- http://tomasmrazek.cz/userfiles/file/labofixiranalerixajadifos.pdfIn PDF document text
- https://iphone-odklep.si/vsebina/15718076795.pdfIn PDF document text
- https://96662888.com/editor_upload/file/73362844953.pdfIn PDF document text
- https://oxi-dental.ro/imagini_ws/73866795142.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_off0000c828.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC828	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e03f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE03F	10500 bytes
SHA-256: `0c68f6287d17e21cc3fbfa0cfe48ee6292387e73d78b3e47cd56e0a2c4d5e495`
`font_02_sfnt_off0000f7ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7FF	17288 bytes
SHA-256: `213244f16c3784e6f645ccbf1b0a80b080dd602cd68b65c1bd92ba6e43887e03`

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