PDF malware analysis — malicious · 41e6b73ac441acae

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 08:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ccb15008e62f3dc89a0a426863b1be37 SHA-1: bff846c106250b809f2e2f65e104df3669e7aaf7 SHA-256: 41e6b73ac441acae37df16f16a8d6ea639a8e97ac55ac21da3311e77a87d9d5b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Numerous external URLs are present, suggesting a potential download or redirection chain.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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.
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=put+the+planets+in+order+from+the+sun PDF link annotation
- http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/65199252836.pdfIn PDF document text
- http://esrafisek.com/images_upload/files/lowelotubusawigujelulos.pdfIn PDF document text
- https://srmhomes.com/images/bulk_images/files/49087198249.pdfIn PDF document text
- http://fra2ange.it/userfiles/files/xarojam.pdfIn PDF document text
- http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/39658549360.pdfIn PDF document text
- http://vevo.keresztessyoptika.hu/elemek/file/sivulupelulivab.pdfIn PDF document text
- http://cayxaotamphan.net/userfiles/image/file/mupovawoj.pdfIn PDF document text
- https://ximatinhdongnai.com/app/webroot/files/images/pages/files/sefum.pdfIn PDF document text
- http://sasolution.kr/userfiles/file/34467485257.pdfIn PDF document text
- http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vudikolavixonaveta.pdfIn PDF document text
- http://lovesenergy.com/file/67218888279.pdfIn PDF document text
- https://z87992961.com/upload/files/20210904140618.pdfIn PDF document text
- http://thesciencenetwork.org/uploads/files/25743473088.pdfIn PDF document text
- http://feldbach-tourismus.at/files/77366959224.pdfIn PDF document text
- http://cathyknightwaite.com/ckfinder/userfiles/files/ralatunonojajat.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614396192f30b---80300273705.pdfIn PDF document text
- https://www.groupe-coelho.fr/ckfinder/userfiles/files/23970460393.pdfIn PDF document text
- http://flyingwedge.com/uploads/assets/file/99681298110.pdfIn PDF document text
- http://www.sec-ollivier-associes.fr/www/upload/file/vapovizef.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/a6iibuhme4e0q9cpo4gk3dhikf/gepidabadipan.pdfIn PDF document text
- https://seo-methodes.com/userfiles/file/2216952640.pdfIn PDF document text
- https://prokoncept.hu/admin/blogfck/image/file/66017306276.pdfIn PDF document text
- http://zhuxintrading.com/uploads/ckfinder/files/20210910/16312466426567.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_off0000d85c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD85C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f073.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF073	10864 bytes
SHA-256: `49f71728a577ac2944925c86eb22852dc45b19ba4a08018b79c4eec43f9012f0`
`font_02_sfnt_off0001095a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1095A	18392 bytes
SHA-256: `e9244908c43cd7e91a7ab566cd6df8f90ce0f66d677a494e769a6b307e45b4c5`

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