MALICIOUS
216
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
The PDF contains a malformed stream and multiple heuristics indicate malicious intent, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK. The primary URL, https://jacksth.ru/strik?utm_term=how+to+play+the+french+horn+wikihow, is identified as a redirector likely used for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to a 'wikihow' article.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
Heuristics 7
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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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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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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://jacksth.ru/strik?utm_term=how+to+play+the+french+horn+wikihow PDF link annotation
- https://cdn.sqhk.co/noperizapewo/jiuZtji/xitazafuziga.pdfIn PDF document text
- http://xejevojesinil.22web.org/bugimikolevawuviga.pdfIn PDF document text
- https://cdn.sqhk.co/poniroxam/jjdj0jh/78024225463.pdfIn PDF document text
- http://femonejigajape.mywebcommunity.org/business_case_presentation.pdfIn PDF document text
- https://cdn.sqhk.co/wumerelup/hhfjdfw/wsdot_traffic_alerts_twitter.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/degisapemifa/english_heritage_stonehenge_audio_guide.pdfIn PDF document text
- http://kisalonokexiwi.atwebpages.com/14767046750.pdfIn PDF document text
- https://s3.amazonaws.com/sisaxu/howls_moving_castle_theme_piano_cover.pdfIn PDF document text
- http://nekanonesogur.rf.gd/zagibefuvuwodavadawef.pdfIn PDF document text
- https://s3.amazonaws.com/fuwawibu/44653923969.pdfIn PDF document text
- https://s3.amazonaws.com/davolazupivowi/free_basic_english_lessons_for_beginners.pdfIn PDF document text
- http://nizowozutagele.atwebpages.com/mirevetodemowojap.pdfIn PDF document text
- http://letulirabe.epizy.com/96987160368.pdfIn PDF document text
- http://roboketisi.rf.gd/fufalunajisaluxedolunad.pdfIn PDF document text
- http://bopubedoru.myartsonline.com/ms_excel_tutorial_2020.pdfIn PDF document text
- https://s3.amazonaws.com/budovewesekaz/jekokupinipewud.pdfIn PDF document text
- https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_a28eb24e067e479eb463a529bce68f95.pdf?index=trueIn PDF document text
- https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_34947193aa7e40f1acee79e4276f5fd3.pdf?index=trueIn PDF document text
- https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_818c5868e40040ac9abb90f65466df00.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
stream_004_off00015975.bin |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0x15975 | 23944 bytes |
SHA-256: f560743d8738e6250d91d993ba6d076601996e87b5117fad0a17f7a0665fea36 |
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font_00_sfnt_off00011eff.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x11EFF | 5144 bytes |
SHA-256: 7e4409d40a3a75e1bb25834b6067cc6d0c94225be91bc143c7dc0bf3b027a68e |
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font_01_sfnt_off00013094.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x13094 | 12528 bytes |
SHA-256: 0d552b86e6443f1bff61d698c088805c93093441bd1f314195d8b88b13646a6d |
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