MALICIOUS
186
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The sample is a PDF document flagged by multiple heuristics and ML classifiers as malicious, specifically identified as a phishing trojan by ClamAV. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software disguised as a browser update or extension. While no scripts were directly extracted, the malformed stream length and numerous external URIs suggest exploitation or redirection attempts. The document body is heavily obfuscated, preventing a direct analysis of its textual content.
Machine Learning
- Nyx PDF Classifier malicious score 0.9977
Heuristics 7
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ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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Browser extension / update installation lure high SE_BROWSER_INSTALL_LUREDocument 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
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Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTHA PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARMSmall 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.
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External URI info PDF_URIPDF contains an external URL action
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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://aynispirit.nl/userfiles/file/96062811411.pdf In PDF document text
- http://kantipursecurity.com/userfiles/file/91789953173.pdfIn PDF document text
- http://jinanxintiandi.com/userfiles/files/36878606567.pdfIn PDF document text
- http://linza-market.ru/upload/files/rigedume.pdfIn PDF document text
- http://4grd.com/cmsimages/file/68275162105.pdfIn PDF document text
- https://epgeptech.hu/ckfinder/userfiles/files/15531483531.pdfIn PDF document text
- http://sm300159.agchost.com/userfiles/files/fogatu.pdfIn PDF document text
- http://0985028898.kad.tw/kads/ckfinder/userfiles/files/bukesogixol.pdfIn PDF document text
- http://jamesandsons.ca/userfiles/file/rebulakupawidino.pdfIn PDF document text
- https://31app.com/userfiles/file/sofojovozifuzarevoxi.pdfIn PDF document text
- http://www.klccpa.com/userfiles/file/In PDF document text
- http://stoka-saarlouis.de/userfiles/file/fezetobobemowemuzixi.pdfIn PDF document text
- http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/ninopesixuruxodesowu.pdfIn PDF document text
- https://berbagiangka.com/contents/files/lofunokipopeladi.pdfIn PDF document text
- http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/42962235643.pdfIn PDF document text
- https://medarbindia.org/ckfinder/userfiles/files/37983557509.pdfIn PDF document text
- http://showpalmedical.com/userfiles/67599897078.pdfIn PDF document text
- http://gazdalkodjokosan.hu/img/userfiles/file/lexiwud.pdfIn PDF document text
- https://sangolongphuong.vn/longphuong/news/files/45602558205.pdfIn PDF document text
- http://tattooindex.nl/images/uploads/79722862823.pdfIn PDF document text
- http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/35140278202.pdfIn PDF document text
- http://pkynfe.net/userfiles/file/xivukov.pdfIn PDF document text
- https://turkeyinsurance.info/images/file/76235532772.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+remove+default+settings+on+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_off0000dd3a.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xDD3A | 16792 bytes |
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
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font_01_sfnt_off0000f551.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF551 | 10940 bytes |
SHA-256: 0b8d9fe39d0fa2903943f5b1ddb76fd5100bc5d90a757a6f850757dc8a0764a4 |
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font_02_sfnt_off00010e77.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10E77 | 19328 bytes |
SHA-256: 8fe91fe92979ed2fb4730eda09e42b5da250d119c5860147a3a1f27647609eaa |
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