MALICIOUS
256
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
T1203 Exploitation for Client Execution
The PDF contains heuristics indicating it's a malformed exploit stream and a link farm, with one URL identified as an SEO redirector for a 'free-download phishing' lure. The document body, though heavily obfuscated, contains metadata suggesting it's generated by wkhtmltopdf. The presence of a 'Clipboard command execution lure' heuristic suggests the document may instruct the user to interact with the clipboard to execute commands, further indicating malicious intent. The ML classifier and ClamAV detection strongly support its malicious nature.
Machine Learning
- Nyx PDF Classifier malicious score 0.9998
Heuristics 8
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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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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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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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Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LUREDocument tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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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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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://trafffi.ru/strik?utm_term=spina+bifida+cystica PDF link annotation
- https://cdn.sqhk.co/xulawajikigi/S4e3PMg/yandex_browser_free_download.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4478415/normal_5fa91063d63d2.pdfIn PDF document text
- https://cdn.sqhk.co/tiruxugajo/hggYihL/xebimaduvopisow.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4408704/normal_5fe210e15366a.pdfIn PDF document text
- https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/bezanusura-ximibotuzonud-wufirapoke-papas.pdfIn PDF document text
- https://cdn.sqhk.co/jujirepak/jfjcHii/78922545844.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/a67bfd2e-6a94-4fe4-98a0-d47af057965b/rizogatovafegizez.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0724757c-9127-4ec2-b412-22abc23c166a/11813780716.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/515c25d0-0ceb-4202-a6d3-7f12624f14da/texas_family_law_practice_manual_form_4-2.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6886e418-0aa2-4e67-9412-10f942406064/tamajes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e8cf24f1-4a64-4384-b9ac-069be5278e7c/wuwiver.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1672da72-55e0-41c8-8cbe-5beed962291b/69421430011.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://scripts.sil.org/OFLIn PDF document text
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off0000e936.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xE936 | 5368 bytes |
SHA-256: d4f6640b2be4f776c74655d83321d275897fbf8a8c0dd0823ee9c28dc758128f |
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font_01_sfnt_off0000fb8d.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xFB8D | 11856 bytes |
SHA-256: 7f62c74a8f8f3392182e04fc90232b480f99f5cb2e99dc548a380e325ec4d48d |
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