PDF malware analysis — malicious · 19f61e6f94fb2ce8

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 03:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 40ffe798c052e785ce8f77ef81e9b9dc SHA-1: 7d41f1d4f50b8178260dc894ef68460a39421506 SHA-256: 19f61e6f94fb2ce8a32f08ece8432126f2092870261ac5b4c879572d728849ad

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=ultdata+for+android+free+registration+code PDF link annotation
- https://incense888.com/uploads/files/202109140755201613.pdfIn PDF document text
- https://soyana.de/js/ckfinder/userfiles/files/32220025440.pdfIn PDF document text
- http://salt17.com/userfiles/files/rurenemizewefodexabefapub.pdfIn PDF document text
- http://arniestribu.com/campannas/file/35152654728.pdfIn PDF document text
- http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/xatitazefogusodob.pdfIn PDF document text
- https://rugsdirect4u.com/uploadedfiles/file/waguf.pdfIn PDF document text
- http://dnt-mayak.ru/content/File/60326183960.pdfIn PDF document text
- http://zbigniewrodak.pl/galeria/file/befusudoliviwisetetize.pdfIn PDF document text
- http://www.ufolep-69.com/contenus/files/48147692238.pdfIn PDF document text
- http://4x4autok.hu/userfiles/files/40391379973.pdfIn PDF document text
- http://adasbruiloften.nl/userfiles/file/36623742441.pdfIn PDF document text
- http://thebodyclubonline.com/userfiles/file/73069716647.pdfIn PDF document text
- http://gonganmi.com/userfiles/file/93706851622.pdfIn PDF document text
- https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/72486664083.pdfIn PDF document text
- https://tennis-samara.ru/img/file/50077707517.pdfIn PDF document text
- http://wellfoto.cz/pictures/files/64469820268.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139d204a5841---tupiwug.pdfIn PDF document text
- https://casabresciani.it/uploads/file/36126645369.pdfIn PDF document text
- http://supragyn.cz/userfiles/file/nudopipuzabexalav.pdfIn PDF document text
- http://aldobini.it/userfiles/files/kikegisipeguvavejadolapa.pdfIn PDF document text
- http://healhumanity.foundation/userfiles/file/lanelajoxifabodivokobob.pdfIn PDF document text
- http://sigmabhp.pl/userfiles/file/35912407253.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394411518---14815910243.pdfIn PDF document text
- http://avandcie-automation.fr/ckfinder/userfiles/files/golawenusasegufujanij.pdfIn PDF document text
- http://kramnyca.info/img/upload/editor/file/gilakujomod.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_off0000cdbd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDBD	10660 bytes
SHA-256: `04ae9e7e27447a3385f2ba233570b37cd75244cccac059c5ad4317492658c85c`
`font_01_sfnt_off0000e603.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE603	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fe15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE15	17172 bytes
SHA-256: `3159301bc0abe81ec67d539f50c8b73c96646802c8e12864295ce13b597d5070`

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