PDF malware analysis — malicious · 00e5352765d3f2e3

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 14:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 1ea53f6cdc1c8b658cd59c30e3781f9a SHA-1: 833b77f43c98bf0e2db61124cd1f4965f57635f1 SHA-256: 00e5352765d3f2e3889fd145028d2a01af837e3e710b7dd0bfc3df8205fd5a68

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on potentially disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://palyavalaszto.hu/teszt/upload/file/dutowimisoju.pdf In PDF document text
- http://hengtongrongshang.com/jingkelun/userfiles/files/20210906193429.pdfIn PDF document text
- http://innotack.com/userfiles/files/xixemojuvetumagit.pdfIn PDF document text
- http://klhl.com/userfiles/file/famujipozal.pdfIn PDF document text
- http://controldellaves.com/app/webroot/arxius/file/38178117818.pdfIn PDF document text
- http://owop.challengersports.com/ckfinder/userfiles/files/nefavowazogatalure.pdfIn PDF document text
- http://musclecar-taps.com/js/upload/files/leneminaj.pdfIn PDF document text
- http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/gosagufoxedurutopu.pdfIn PDF document text
- http://buydecor.ru/uploads/files/51970738308.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e6794fd7f2decfcbb8d595559cf4b894/16667256970.pdfIn PDF document text
- https://nbcmedia.vn/ckfinder/userfiles/files/lukowulomajopirugatebemi.pdfIn PDF document text
- http://kvbm.org/pds/userfiles/files/zelesupofixupugomobegajod.pdfIn PDF document text
- http://dobrasekacka.cz/userfiles/file/526484667.pdfIn PDF document text
- http://architettodrabeni.it/userfiles/files/boxolutudetomuso.pdfIn PDF document text
- http://alt-1c.ru/userfiles/file/68750548274.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/misirikabapusifajif.pdfIn PDF document text
- http://seychelles-resort.com/images/blog/file/dozidiniboka.pdfIn PDF document text
- https://csmgh.net/pevron/www/img/file/fivuw.pdfIn PDF document text
- http://sarkanyhajo.hu/files/file/vimilonatawezoxodewewu.pdfIn PDF document text
- https://rougezenekar.hu/files/file/josazo.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.org/upload/files/bokepux.pdfIn PDF document text
- http://dakmoto.cz/obrazky/file/lojiveratebuwu.pdfIn PDF document text
- https://onderdurdu.com/upload/ckfinder/files/xodawewadejasoromobo.pdfIn PDF document text
- http://jayeonrak.com/upfile_editor/2021/files/70842617574.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+free+ms+office+app+for+androidPDF 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_off0000ea79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA79	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10290	10788 bytes
SHA-256: `85df21486de59ddf32ef2cd8b2d020b52a9e93ea9f15598af6a1a28e28872b1e`
`font_02_sfnt_off00011b6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B6E	17180 bytes
SHA-256: `b80152d459eb6f38569f4c22725de5e827f9705f641da4f7cec647e13bf2d62a`

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