MALICIOUS
136
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating phishing and potential trojan behavior. A high-severity heuristic identified an image lure linking to an SEO redirector, specifically 'https://krisoc.ru/square?utm_term=have+not+received+my+new+driver%27s+license', which is likely used for phishing. The document body was unreadable, but the presence of external URI and redirector heuristics strongly suggests a phishing attack.
Machine Learning
- Nyx PDF Classifier malicious score 0.6359
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://krisoc.ru/square?utm_term=have+not+received+my+new+driver%27s+license PDF link annotation
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8594f74e14172ddf2310b/1625839951470/41011446630.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec784b5c244202458a501d/1626110027741/zefudoziruzepaxedorapitol.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7b26dd2ac847ff7dc7dc/1626110758868/current_annual_increment.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_off0000fba3.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xFBA3 | 16708 bytes |
SHA-256: 10530aa751952fbfcb2cd51d7c081173afc1da6a3320629a5a9b74c52e13846f |
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font_01_sfnt_off0001273e.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x1273E | 10820 bytes |
SHA-256: 09f3917799aacac2d47c3642e6077f55dcbea3d25c1620083330f784c266823c |
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font_02_sfnt_off00014040.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x14040 | 16792 bytes |
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
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