PDF malware analysis — malicious · 0fbc4e0d0790e994

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 14:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: da68ac527095625a5f918579155f1018 SHA-1: 0fa836d8042ef7942fcb41ad9003fddd1d503a50 SHA-256: 0fbc4e0d0790e994ff496db7192acd0e80600cccb37c5a556a14ec9c91c7f0db

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically disguised as a download link for a popular mobile game. This suggests an attempt to trick users into visiting malicious sites or downloading malware. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=mobile+legends+latest+apk+download PDF link annotation
- http://xn--b1akwe.xn--p1ai/userfiles/file/jidaweworufujamixoli.pdfIn PDF document text
- http://trumoi-khutrung.com/upload/files/59161072325.pdfIn PDF document text
- http://plymouth-logs.co.uk/ckfinder/userfiles/files/tufinovejosovobow.pdfIn PDF document text
- http://sdds.be/userfiles/file/1392640920.pdfIn PDF document text
- http://vivatbacchus.hu/files/file/zejiwowedivugurepagafolas.pdfIn PDF document text
- http://uralcomservis.ru/crn_fls/crn_files/5200949580.pdfIn PDF document text
- http://distant-property.ru/fck_editor_files/files/37400394896.pdfIn PDF document text
- http://elturo.ru/img/upload/files/39508152211.pdfIn PDF document text
- http://clinicaveterinariagussago.com/userfiles/files/46277447888.pdfIn PDF document text
- http://vidol.eu/userfiles/file/fefamiziriju.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161395c3625127---xemororip.pdfIn PDF document text
- http://toyotaprius-custom.com/js/upload/files/72940153225.pdfIn PDF document text
- http://bsbcarpet.com/userfiles/file/68877106682.pdfIn PDF document text
- http://the100voicesofgospel.de/fichiers/newsletter/file/29008641611.pdfIn PDF document text
- http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/96564337819.pdfIn PDF document text
- http://vidol.nl/userfiles/file/wuxuzapiremidexuxotego.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/50438922472.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2ed9aaf8---14512463955.pdfIn PDF document text
- http://uhorder.com/upload/files/59602682616.pdfIn PDF document text
- http://rivebistro.net/ckfinder/userfiles/files/vumogifepiwox.pdfIn PDF document text
- http://myucpb.com/userfiles/file/ferutewunolot.pdfIn PDF document text
- http://corporatiegids.nl/uploads/files/62094376625.pdfIn PDF document text
- http://caycanh.vn/images/fck/file/wumelasubiximeserirabubuz.pdfIn PDF document text
- http://galeriejacqueselbaz.com/userfiles/file/22926575727.pdfIn PDF document text
- http://snbedu.com/uploadfile/file///2021090315002960.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_off0000dac1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAC1	18316 bytes
SHA-256: `a29272c0c72d28366e8e4648e5ef842e2c03163cc709c2b1a922b01de671ed01`
`font_01_sfnt_off00010a0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A0C	10776 bytes
SHA-256: `5bc645a5338cc33429cd823e50f19f7fadb591cea7f1f33f42353509fae3eb62`
`font_02_sfnt_off000122a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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