PDF malware analysis — malicious · b615ef4e69183525

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 13:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 079e5d6cae6de4be458575beffbb21bf SHA-1: ea1f7501d29ec5ad14c7b52eedcd780995bdf081 SHA-256: b615ef4e69183525c68dd3ad6c755f7d3b39f9d10307c16c943e7cec222726da

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=pc+games+that+can+be+played+on+android PDF link annotation
- http://pataibicaj.hu/userfiles/file/mewaregejopapulozevegeko.pdfIn PDF document text
- http://burragebrothers.org/demo/jolie/beta/userfiles/files/tibaguzeni.pdfIn PDF document text
- http://materialdeestudo.top/userfiles/files/ketulalodimezarawarivuk.pdfIn PDF document text
- http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gezojukiwagi.pdfIn PDF document text
- http://daydeothe.vn/rich_editor/file/finabefip.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///57770477162.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32334050321.pdfIn PDF document text
- http://snuhonors.com/userfiles/file/70095859458.pdfIn PDF document text
- https://hkbca.org/UploadFiles/file/20210904195900195.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/kenerotukigegeborewi.pdfIn PDF document text
- http://knuhpharm.kr/userfiles/file/20210910200919.pdfIn PDF document text
- http://geredekombiservisi.com/userfiles/file/wixubipefanulanobepas.pdfIn PDF document text
- http://tinavaron.com/ckfinder/userfiles/files/lenasup.pdfIn PDF document text
- http://doktor-okonski.pl/uploadimg/file/51903334012.pdfIn PDF document text
- http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/zikexenavepovesogiva.pdfIn PDF document text
- https://sambelteri.com/contents/files/50638958512.pdfIn PDF document text
- https://samudra99.com/contents/files/widilagarosekosawavusaka.pdfIn PDF document text
- http://ulsantour.com/FileData/ckfinder/files/20210908_911CF9A1EEA53ACB.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab7f71f2d---1571019288.pdfIn PDF document text
- https://nedimgame.net/calisma2/files/uploads/jenupabukokavajebe.pdfIn PDF document text
- http://abworder.com/uploads/files/kimabutewurisumabukefiv.pdfIn PDF document text
- http://fasson.vip/images/editor/files/98648022475.pdfIn PDF document text
- http://ibarugi.com/fckeditor/userfiles/file/33510645205.pdfIn PDF document text
- https://vozilasavozacem.rs/files/67878374818.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_off0000dbee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBEE	17720 bytes
SHA-256: `1a39f6793c935caca382cc5c8ec9f33cfb1e0e7d00765ac470d4bd7ad2a16c3e`
`font_01_sfnt_off000109a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000121bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121BD	11216 bytes
SHA-256: `b9e0643ff224f5706282f549fab79407d3805a2faf4686170ed14099063a0377`

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