MALICIOUS
186
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked sites. The primary IOCs are the external URLs found within the document.
Machine Learning
- Nyx PDF Classifier malicious score 0.9998
Heuristics 6
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ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARMSmall PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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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://nipisod.ru/123?utm_term=mcent+browser+apk+mirror PDF link annotation
- https://static.s123-cdn-static.com/uploads/4368477/normal_6008f984abd02.pdfIn PDF document text
- https://cdn.sqhk.co/sunomedude/HBibS0j/treasure_hunters_series_common_sense_media.pdfIn PDF document text
- https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/rakikekumuj.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4459621/normal_5fdac68593bec.pdfIn PDF document text
- https://sudefenumub.weebly.com/uploads/1/3/5/9/135984534/35d518c5a.pdfIn PDF document text
- https://cdn.sqhk.co/zarejesorufo/giNr9cH/sepsis_guidelines_sofa_score.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_4172a8a8f1e941d084fb4a16c31c35e6.pdf?index=trueIn PDF document text
- https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_cb5e8797db2047f59dfbe5786933576a.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/piradi/77542219081.pdfIn PDF document text
- https://s3.amazonaws.com/tigewibejageju/23164814427.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/16ea8308-c54d-4500-bca6-83338f17f1f9/does_hatchet_have_a_sequel.pdfIn PDF document text
- https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_a221e9f303e1416da20cb010c6f5ee10.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/5ce5ad1e-6a06-4456-8f3d-8143adc438d1/cuanto_kilos_tiene_un_metro_cubico.pdfIn PDF document text
- https://s3.amazonaws.com/pirofopafu/free_templates_html5_css3.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e195ee0f-e40e-4497-8e43-81f5b1bdfaea/math_games_for_grade_4_multiplication_and_division.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2f7aedcc-401c-437f-a065-f6e92b5c4501/que_es_recoleccion_de_datos_estadistica.pdfIn PDF document text
- https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_1d6299ae32fb4e348d32f510991b53d6.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/501bbed1-8464-4988-a388-d1e251d0abfb/lodemugiziv.pdfIn PDF document text
- https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_49eaa16d950a4b46992d04f3c4f8561d.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000cbab.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xCBAB | 5348 bytes |
SHA-256: 61f6c48b08da1330d1543f3d50dc5c9091eeaedc7a2d704467468bfa7aaa9c68 |
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font_01_sfnt_off0000dde4.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xDDE4 | 10376 bytes |
SHA-256: 108c75395e66852e46fc18db3557151c18a11b9fef8de8cd0b3632b7654fbc4e |
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font_02_sfnt_off00010195.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10195 | 16164 bytes |
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8 |
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