MALICIOUS
136
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a URL that appears to offer free downloads. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://synerhu.ru/square?utm_term=psychiatric+nursing+practice+test+questions+with+answer+key+pdf` is the primary IOC, likely serving as a redirector to a malicious payload.
Machine Learning
- Nyx PDF Classifier malicious score 0.5959
Heuristics 5
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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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Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINKPDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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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://synerhu.ru/square?utm_term=psychiatric+nursing+practice+test+questions+with+answer+key+pdf PDF link annotation
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92a411a746407a428830/1626116772347/kusemotazazaroni.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9332783ae0c490239b13a/1625895719905/mibidumes.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec813ec217102653d60272/1626112318407/all_about_capricorn.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec82bae64ce5371634b970/1626112698425/12717472404.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_off0000f172.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF172 | 11392 bytes |
SHA-256: c3cccc334c62e7f5fe40e79b5f8ca780911ea89601b843d2e81aa7f6f1d31c58 |
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font_01_sfnt_off00010be6.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10BE6 | 16792 bytes |
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
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font_02_sfnt_off000123f8.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x123F8 | 17128 bytes |
SHA-256: 745a2cbd4834390cc3532848ff2202c6a042a24db1c8447f98c765c955c0d778 |
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