PDF malware analysis — malicious · 9355c541114b29af

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 08:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1b489ed77bd3253ae251e181787af31d SHA-1: acc2589f0be22f6c0ff1e47b470ea894600907e6 SHA-256: 9355c541114b29af932ee49aa42e1bdfbda42c8a1150376315dbab2d309c9401

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with critical and high severity heuristics indicating its nature. The presence of embedded JavaScript and numerous external URIs, including one pointing to a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

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://inwebjor.ru/uplcv?utm_term=best+video+creator+app+for+android PDF link annotation
- http://tugrabilgisayar.net/resimler/files/kasugekebewedilerives.pdfIn PDF document text
- http://fred-robin.com/ckfinder/userfiles/files/masabasamofuju.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3a598bd584b740ec9243bfc6177b2da5/59205300746.pdfIn PDF document text
- https://linhngapt.vn/upload/files/51173566916.pdfIn PDF document text
- https://gtnet-engine.com/ckfinder/userfiles/files/jixot.pdfIn PDF document text
- https://delaneyllc.com/ckfinder/userfiles/files/bokadotafefepi.pdfIn PDF document text
- http://dolekkoyum.com/admin/UserFiles/file/nurumutesepewajedugo.pdfIn PDF document text
- http://potya.com/fobadu.pdfIn PDF document text
- https://miraclechuppahs.com/userfiles/file/33008831923.pdfIn PDF document text
- http://zhuoer.ltd/userfiles/file/21815151744.pdfIn PDF document text
- https://floridahouselottery.com/test/userfiles/file/62875317437.pdfIn PDF document text
- http://ohdiabo.net/images/ckeditor/files/92841001224.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c386305493---59263792625.pdfIn PDF document text
- http://phutungototuanphat.com/img-tvdl/files/totelogerideluvagakedumif.pdfIn PDF document text
- http://emrc.ie/upload/imagecontent/file/24525441889.pdfIn PDF document text
- http://njchemland.com/upload/files/xujugepuvafifi.pdfIn PDF document text
- http://evolution-dev.com/file_media/file_image/file/80190937809.pdfIn PDF document text
- http://ebus.cn/up_file/file/sonumaraxenob.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/35938822567.pdfIn PDF document text
- http://ville-dammarie.com/ckfinder/userfiles/files/20510900534.pdfIn PDF document text
- http://hwangtosidae.com/userData/ebizro_board/file/sapoxazovakadeludajedo.pdfIn PDF document text
- http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/zexeke.pdfIn PDF document text
- http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/41277656750.pdfIn PDF document text
- http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/18082108617.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_off0000edc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105DC	10688 bytes
SHA-256: `4868923bd265c919e9f42c3caf5ee5b769089cec076bb97a81d8e177045dd63c`
`font_02_sfnt_off00011e8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E8B	17332 bytes
SHA-256: `136e6d08b4721ec391a9f0598900963c5341c965f50d8d5756e8eea6da5eede8`

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