PDF malware analysis — malicious · be63951b227bbfc1

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 19:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 255edcedd5a9c2234db4b4e17b8ca37a SHA-1: 6fd81b396fcb039c1b4fdfc204caa2af9e396e1c SHA-256: be63951b227bbfc158e68bdc5cdcf7038afb9793dfd635f74a583e3c933274b7

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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of linking to external sites suggests a spearphishing attachment vector.

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 https://chcial.ru/uplcv?utm_term=accounting+information+system+multiple+choice+questions+and+answers+pdf PDF link annotation
- http://www.tempshift.com/app/webroot/files/uploadimagesfile/gekowetafafejibo.pdfIn PDF document text
- http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/55338064069.pdfIn PDF document text
- https://resortweeks.pro/userfiles/file/zebugijivojatomadawire.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d80183453b0c99a93068a7764ad2bc8b/korufelolarude.pdfIn PDF document text
- https://kozmetikadunakeszi.hu/userfiles/file/11845471427.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/vugupelebeb.pdfIn PDF document text
- https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jipemerebitamajexatetelo.pdfIn PDF document text
- http://land89.com/ckupload/files/lidabipibifulod.pdfIn PDF document text
- http://duhochoangthanh.com/upload/files/78885355062.pdfIn PDF document text
- http://compow.net/ckfinder/userfiles/files/77399125537.pdfIn PDF document text
- http://theexplorerthai.com/userfiles/files/65178518355.pdfIn PDF document text
- http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/87052406849.pdfIn PDF document text
- https://recapress.com/ckfinder/userfiles/files/kusiwujevutumaziwenukiro.pdfIn PDF document text
- http://retco.ge/ckfinder/userfiles/files/ganike.pdfIn PDF document text
- https://armature.ir/cache/fck_files/file/gomajosokebum.pdfIn PDF document text
- http://dintainoodle.com/uploads/files/dujaropolusoj.pdfIn PDF document text
- https://ajansnigde.com/resimler/files/zonebaxipavukewuzuteru.pdfIn PDF document text
- https://prestinireedcorp.com/userfiles/files/kupidetawosijap.pdfIn PDF document text
- http://ayurvedicclinic.org/userfiles/file/gikogomulakegezixujutorej.pdfIn PDF document text
- http://dolphinkorea.com/files/files/70059491968.pdfIn PDF document text
- https://netlandschool.cl/files/kemapawazinovubaji.pdfIn PDF document text
- http://burragebrothers.net/demo/jolie/beta/userfiles/files/vifoviligatoxutuxiju.pdfIn PDF document text
- http://wumag.pl/userfiles/file/34111382130.pdfIn PDF document text
- https://corpusbg.com/files/fck/file/rokuwovibegap.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_off0000b15b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB15B	11492 bytes
SHA-256: `547e42d75aee9f196c5b34cc13bdaaf3b9fabbb74600b925a804ef0b8f07975a`
`font_01_sfnt_off0000cbfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBFA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e40c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE40C	16548 bytes
SHA-256: `0ddf1c2792a5f3d2aded062c190444ad32e51426dbd7e66e5d9a00d7ab310393`

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