PDF malware analysis — malicious · 9983ca0b53cfd98f

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 09:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 74640060d28a5796f7d40d3101b1b09a SHA-1: 3b0664ca8561058532a8e4b24a1535fb93e680ac SHA-256: 9983ca0b53cfd98ffba00c9277dd51e9ad479f517cee3259c1cb36a0cb740154

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The embedded JavaScript likely serves to redirect the user or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://apartmani-mestrovic-krk.hr/files/65651722662.pdf In PDF document text
- http://ztracenaexistence.cz/files/content/file/48383548704.pdfIn PDF document text
- https://777mto.info/contents/files/97867015902.pdfIn PDF document text
- http://barefoot.pl/userfiles/file/sofuvetiwep.pdfIn PDF document text
- https://profix.fr/ckfinder/userfiles/files/69324310119.pdfIn PDF document text
- https://mimpishio2bet.com/contents/files/32970347056.pdfIn PDF document text
- http://ultraljud.nu/bild/files/gezis.pdfIn PDF document text
- https://alihuata.com/userfiles/file/dewokuvedaj.pdfIn PDF document text
- http://rm-centr.ru/uploads/file/27713813132.pdfIn PDF document text
- https://ozmutludokum.com/userfiles/file/memarikarobokuzezorivi.pdfIn PDF document text
- http://nagakuratrading.com/js/upload/files/42776245118.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/73031481408.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147e96a6e5a9---62161834528.pdfIn PDF document text
- https://mimpishio2bet.com/contents/files/vuwefavavegipon.pdfIn PDF document text
- https://graveyards-fuj.ae/userfiles/files/xugob.pdfIn PDF document text
- https://store-connector.com/_upload_bilder/_filemanager/file/wapusalenixibopuwozu.pdfIn PDF document text
- http://newdimension.su/userfiles/file/fugobidademavutado.pdfIn PDF document text
- https://websbag.com/uploads/files/14202949216.pdfIn PDF document text
- https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/61100975885.pdfIn PDF document text
- http://tubesealer.com/uploaded/file/1888236327612f2c8b585c9.pdfIn PDF document text
- https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/bifobejugezadigufafezus.pdfIn PDF document text
- http://wakesup.org/userfiles/file/rakizoki.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ec4e29rlf4o93a60mlrdgrec97/zituxegimibikinemuwe.pdfIn PDF document text
- http://studioiulianella.it/userfiles/files/mijaneroluxibixe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=black+panther+full+movie+mp4+downloadPDF 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_off0000f05f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF05F	11192 bytes
SHA-256: `0948325f8b789dbd7e736aacdb28d09bfd7d0edb5e4eaf59f1c2d55c99eb006f`
`font_01_sfnt_off00010a76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A76	18504 bytes
SHA-256: `50d6dd9da1773740e171c8d3110c9a3dd74b61f448dccb539ff22a531346ca16`
`font_02_sfnt_off00013ad0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AD0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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