PDF malware analysis — malicious · a7580408bbda5e94

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 04:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: bf5fb9eb9713a8739cea7cd53f05d465 SHA-1: 424b6b8e72f677d1f58521ed9402efac4b44b707 SHA-256: a7580408bbda5e94410d98e046edacc430b95bbb075dc5e1ae8649d48cb3f69f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to disposable domains or link farms, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this sample as malicious, reinforcing the assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/muwud.pdf In PDF document text
- https://myshalewell.com/userfiles/file/pikogidodol.pdfIn PDF document text
- http://srs-budapest.hu/uploads/files/tumazenulokiboti.pdfIn PDF document text
- https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/78659785599.pdfIn PDF document text
- http://kredoteka.ru/uploads/file/55838838012.pdfIn PDF document text
- http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/66850238296.pdfIn PDF document text
- http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
- http://nbkhjc.com/uploads/202109/file/2109031655127446488lgt2a48igvp.pdfIn PDF document text
- https://incense888.com/uploads/files/202109080743395774.pdfIn PDF document text
- https://geneolock.com/locktactyuma/userfiles/file/zijeni.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8ace606f---69376031860.pdfIn PDF document text
- http://technoprofile.ru/userfiles/file/5705526584.pdfIn PDF document text
- http://brainbond.ro/userfiles/file/61719935439.pdfIn PDF document text
- https://glaze-metalart.com/upload/files/laserumaferajexifizelesob.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414eae9034---wupixipudagumewuxu.pdfIn PDF document text
- https://tktravelkorea.com/FileData/ckfinder/files/20210909_21A7DDDEC77F8FA3.pdfIn PDF document text
- http://geonatlife.es/ckfinder/userfiles/files/bereduzufukapogosulil.pdfIn PDF document text
- https://1tlstar.com/storage/uploads/files/nomijekoweka.pdfIn PDF document text
- https://hijaustabilo.com/contents/files/19238719274.pdfIn PDF document text
- https://novitas.ro/files/vemaw.pdfIn PDF document text
- http://haiphongcontest.com/images/files/40666095350.pdfIn PDF document text
- https://kaptenhoki.com/contents/files/pavigogodanagepemi.pdfIn PDF document text
- http://bugskin.org/userfiles/file/87151396087.pdfIn PDF document text
- http://kodemari.info/data/files/bimizawumexezuvilek.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=poi+automapa+androidPDF 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_off0000db0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB0F	10308 bytes
SHA-256: `d78af77b4be44512d58b4af56d1fda84047ffda257c397d8d9fa23328df3277e`
`font_01_sfnt_off0000f238.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF238	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A4A	17960 bytes
SHA-256: `72cf0d7d1334a956a0fa6cf616d9b8fc71ce9315de15dcbae6d48ddef2ac6ba3`

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