PDF malware analysis — malicious · cb6fef8588ae550a

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 01:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a1667539f9c9ffb9e4425cf3acec4664 SHA-1: 2c486d4dca68c286e4e74010a4b48250a1b2a673 SHA-256: cb6fef8588ae550a6eea8c3653b9903c73c442ad2b8bc29a5ba7e459463e6b43

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=after+effects+serial PDF link annotation
- https://estoniapools.com/contents/files/nezevixunufebanajowufev.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/49083989513.pdfIn PDF document text
- https://fullmagicweekend.com/ckfinder/userfiles/files/xugezonujuwapuvofeg.pdfIn PDF document text
- https://telechips.com/ckfinder/userfiles/files/mubexako.pdfIn PDF document text
- http://momsystem.ru/public/file/dugosebopimuwejawukosa.pdfIn PDF document text
- http://cristal-in.fr/userfiles/file/58717973743.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffdf0d16bd---58942864522.pdfIn PDF document text
- https://upaspor.com/resimler/files/vanorepejanogawujupilafe.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfa839905a---33584163358.pdfIn PDF document text
- https://ottopianos.nl/files/28973484621.pdfIn PDF document text
- http://lexen.ca/userfiles/files/82908495980.pdfIn PDF document text
- http://scamps.biz/userfiles/file/41987137999.pdfIn PDF document text
- http://cutyoursupport.com/userfiles/file/mategaralasapowurajav.pdfIn PDF document text
- http://risme.vn/files/36153995036.pdfIn PDF document text
- http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/roruzewimazisibuligu.pdfIn PDF document text
- http://krasneclanky.cz/uploads/27899979768.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/94024041506.pdfIn PDF document text
- http://allmedicus.com/userfiles/file/72381846804.pdfIn PDF document text
- http://35ju.21tg.cn/uploadfile/ckeditor/files/vugevi.pdfIn PDF document text
- http://onyx-innovations.com/assets/ckfinder/userfiles/files/43397558471.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/zilusojos.pdfIn PDF document text
- https://jdrum-music.com/uploads/ckfiles/files/jewexoladivad.pdfIn PDF document text
- http://agriturismoilnoceto.com/userfiles/files/18593925070.pdfIn PDF document text
- http://srtcivilnorth.com/ckeditor_file/files/63428997084.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_off0000b5c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5C3	10088 bytes
SHA-256: `c20c5acafa5b40821fe7e2722fc3402943d3dbfd115ea4a05d43dba4d6e242b7`
`font_01_sfnt_off0000cc63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC63	16332 bytes
SHA-256: `a538929f2f3bce878ae6e12c8cb00f78483573732913101cea5ccf5cfa87b3d5`
`font_02_sfnt_off0000f657.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF657	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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